{"title":"Cobalt Reduce Shank Drill Bits","description":null,"products":[{"product_id":"13-50mm-reduced-shank-cobalt-drill-bit-1-2-shank_d-ammco13-50","title":"13.50mm Reduced Shank Drill Bit | Cobalt | 1\/2\" Shank | D\/AMMCO13.50","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eQuantity: 1 PC\u003c\/li\u003e \u003cli\u003eCutting Diameter: 13.50 mm (0.531\")\u003c\/li\u003e \u003cli\u003eShank Diameter: 1\/2\" (12.7 mm)\u003c\/li\u003e \u003cli\u003eMaterial: Cobalt alloy high-speed steel (HSS-Co)\u003c\/li\u003e \u003cli\u003eCoating: None\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eLarge-diameter cobalt drill bit (13.50 mm) designed for drilling through hard metals such as stainless steel, alloy steel, and cast iron\u003c\/li\u003e \u003cli\u003eReduced shank design with a 1\/2\" shank diameter preserves a robust cutting diameter\u003c\/li\u003e \u003cli\u003eEnhanced heat resistance from cobalt alloy extends tooling life under demanding drilling conditions\u003c\/li\u003e \u003cli\u003eSolid geometry engineered to produce clean holes and resist wear in tough materials\u003c\/li\u003e \u003cli\u003eIdeal for metalworking, fabrication, and maintenance tasks requiring large holes in hard metals\u003c\/li\u003e \u003cli\u003eUsage tips: use cutting fluid, maintain moderate speeds, and employ intermittent pecking to clear chips in dense metals\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eShank Diameter: 1\/2\" (12.7 mm)\u003c\/li\u003e \u003cli\u003eCutting Diameter: 13.50 mm (0.531\")\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312679481623,"sku":"D\/AMMCO13.50","price":42.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_1d5dbd0f-3242-4b16-8c17-2b12641440ec.jpg?v=1771714891"},{"product_id":"14-00mm-reduced-shank-cobalt-drill-bit-1-2-shank_d-ammco14-00","title":"14.00mm Reduced Shank Drill Bit | Cobalt | 1\/2\" Shank | D\/AMMCO14.00","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCutting diameter:\u003c\/strong\u003e 14.00 mm\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eShank size:\u003c\/strong\u003e 1\/2\" (0.5 in); reduced shank design\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Cobalt\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 piece\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003e14 mm cutting diameter\u003c\/strong\u003e enables larger-hole drilling in metalworking tasks.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCobalt construction\u003c\/strong\u003e provides improved wear resistance and higher heat tolerance compared with standard high-speed steel bits, extending tool life in tough metals.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eReduced shank geometry\u003c\/strong\u003e maintains a 1\/2\" shank profile while delivering the larger cutting diameter, facilitating use in setups designed for larger-hole bits.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eDiameter:\u003c\/strong\u003e 14.00 mm\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eShank:\u003c\/strong\u003e 1\/2\" (reduced)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Reduced shank drill bit\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePackage:\u003c\/strong\u003e 1 piece\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312679579927,"sku":"D\/AMMCO14.00","price":40.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_fabeb3de-5f9f-45c0-8066-4d0c75827f57.jpg?v=1771714894"},{"product_id":"14-50mm-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-ammco14-50","title":"14.50mm Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/AMMCO14.50","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 14.50 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank\u003c\/strong\u003e: 1\/2\" Reduced\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Cobalt alloy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesignation\u003c\/strong\u003e: D\/ACO\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit count\u003c\/strong\u003e: 1 piece\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCobalt alloy provides high hardness and heat resistance for drilling hard metals such as stainless steel and alloy steels.\u003c\/li\u003e\n\u003cli\u003eReduced 1\/2\" shank design minimizes shank diameter at the tool end, enabling stable engagement in tight work areas.\u003c\/li\u003e\n\u003cli\u003eLarge-diameter capability—14.50 mm hole size—for fast metal fabrication and pass-through hole applications.\u003c\/li\u003e\n\u003cli\u003eDurable cutting edge engineered for longer bit life under high-temperature drilling conditions.\u003c\/li\u003e\n\u003cli\u003eSuitable for through-hole and large-diameter drilling tasks where cobalt tools excel.\u003c\/li\u003e\n\u003c\/ul\u003e 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\u003cli\u003e\n\u003cstrong\u003eShank size:\u003c\/strong\u003e 1\/2\" reduced.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDesignation\/model:\u003c\/strong\u003e D\/ACO.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTarget materials:\u003c\/strong\u003e effective for stainless steel and alloy steels; designed for wear-critical drilling tasks.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e optimized for longer tool life and reduced replacement frequency in demanding machining environments.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eDiameter:\u003c\/strong\u003e 15.00 mm\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eShank:\u003c\/strong\u003e 1\/2\" reduced\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e cobalt steel (high-speed steel with cobalt content)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOverall 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PC\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eCobalt alloy increases heat resistance and edge retention for drilling hard metals such as stainless steel and alloy steels\u003c\/li\u003e \u003cli\u003eReduced-shank design maintains the large cutting diameter with a compact shank profile\u003c\/li\u003e \u003cli\u003eEnhanced wear resistance yields longer bit life under heavy-use drilling\u003c\/li\u003e \u003cli\u003eDesigned for consistent hole quality in harder metals with predictable performance across repeated drilling cycles\u003c\/li\u003e \u003cli\u003eIdeal for fabricating 15.50 mm diameter holes in metalworking, automotive, and fabrication projects\u003c\/li\u003e \u003cli\u003eUse with appropriate cutting fluid or coolant to maximize tool life and achieve cleaner holes\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eShank: 1\/2\" (12.7 mm) – reduced-shank configuration\u003c\/li\u003e \u003cli\u003eCutting diameter: 15.50 mm\u003c\/li\u003e \u003cli\u003eCoating\/material: cobalt HSS for high-temperature performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312679874839,"sku":"D\/AMMCO15.50","price":42.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_b83f7f90-5cbf-41e5-b1b8-74d9c6d2bd5f.jpg?v=1771714903"},{"product_id":"16-00mm-reduced-shank-cobalt-drill-bit-1-2-shank_d-ammco16-00","title":"16.00mm Reduced Shank Drill Bit | Cobalt | 1\/2\" Shank | D\/AMMCO16.00","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 16.00 mm\u003c\/li\u003e \u003cli\u003eShank: 1\/2\" reduced shank\u003c\/li\u003e \u003cli\u003eMaterial: cobalt alloy\u003c\/li\u003e \u003cli\u003eLength: Not specified\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eHeat-resistant cobalt alloy enables drilling through hard metals, including stainless steel and alloy steels, with reduced wear and longer life compared to standard high-speed steel bits.\u003c\/li\u003e \u003cli\u003eReduced shank design with a 1\/2\" shank maintains a compact profile while delivering a 16 mm cutting diameter for larger holes in a single pass.\u003c\/li\u003e \u003cli\u003eEngineered for demanding metalworking tasks where higher cutting temperatures occur during drilling hard alloys.\u003c\/li\u003e \u003cli\u003eDesigned to create clean, precise holes in tough metals when used with appropriate speeds and cutting fluid.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 16.00 mm\u003c\/li\u003e \u003cli\u003eShank: 1\/2\" reduced shank\u003c\/li\u003e \u003cli\u003eMaterial: cobalt alloy\u003c\/li\u003e \u003cli\u003eLength: Not 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Title","offer_id":52312680071447,"sku":"D\/AMMCO16.50","price":42.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_98299eba-0b7e-45d9-91cf-1623f78b81ed.jpg?v=1771714909"},{"product_id":"17-00mm-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-ammco17-00","title":"17.00mm Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/AMMCO17.00","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eDiameter:\u003c\/strong\u003e 17.00 mm\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eShank:\u003c\/strong\u003e 1\/2\" reduced\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Cobalt\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDesignation:\u003c\/strong\u003e D\/ACO\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePack size:\u003c\/strong\u003e 1 piece\u003c\/li\u003e\n\u003c\/ul\u003e 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D\/AMMCO22.50","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eDiameter (cutting): 22.50 mm\u003c\/li\u003e \u003cli\u003eShank diameter: 1\/2\" (12.7 mm)\u003c\/li\u003e \u003cli\u003eConfiguration: Reduced shank cobalt drill bit\u003c\/li\u003e \u003cli\u003ePieces per package: 1\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eCobalt drill bit construction provides enhanced wear resistance for demanding drilling tasks, improving tool life when working with hard metals and tough alloys.\u003c\/li\u003e \u003cli\u003eReduced shank design preserves overall tool strength while enabling a large cutting diameter, enabling efficient hole sizing without needing multiple passes.\u003c\/li\u003e \u003cli\u003eLarge cutting diameter of 22.50 mm enables wider holes in a single pass, reducing rework and cycle time.\u003c\/li\u003e \u003cli\u003eDesigned for stable performance under higher cutting speeds and temperatures, supporting clean entry and accurate hole dimensions.\u003c\/li\u003e \u003cli\u003eUse cases: drilling hard metals and dense alloys where wear resistance and hole size efficiency matter most.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eMaterial: Cobalt\u003c\/li\u003e \u003cli\u003eCutting diameter: 22.50 mm\u003c\/li\u003e \u003cli\u003eShank diameter: 1\/2\" (12.7 mm)\u003c\/li\u003e \u003cli\u003ePieces per package: 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312681218327,"sku":"D\/AMMCO22.50","price":60.54,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_b4a50c00-432f-4d02-89da-eb10e46b5e26.jpg?v=1771714942"},{"product_id":"23-00mm-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-ammco23-00","title":"23.00mm Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/AMMCO23.00","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 23.00 mm\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eShank\u003c\/strong\u003e: 1\/2\" Reduced\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Cobalt\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDesignation\u003c\/strong\u003e: D\/ACO\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eQuantity\u003c\/strong\u003e: 1 piece\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCobalt construction\u003c\/strong\u003e provides enhanced wear resistance when drilling hard metals, including stainless steel and other tough alloys\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e1\/2\" reduced shank\u003c\/strong\u003e maintains cutting geometry while enabling use in standard 1\/2\" tooling setups\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-heat performance\u003c\/strong\u003e designed to sustain cutting efficiency under elevated temperatures common with hard-metal drilling\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOne-piece construction\u003c\/strong\u003e offers rigidity and reduces runout for increased precision\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 23.00 mm\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eShank\u003c\/strong\u003e: 1\/2\" reduced\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePackage quantity\u003c\/strong\u003e: 1 piece\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: One-piece\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312681316631,"sku":"D\/AMMCO23.00","price":57.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_cfaafa56-06eb-4165-a645-38e8f7485896.jpg?v=1771714945"},{"product_id":"23-50mm-reduced-shank-cobalt-drill-bit-1-2-shank_d-ammco23-50","title":"23.50mm Reduced Shank Drill Bit | Cobalt | 1\/2\" Shank | D\/AMMCO23.50","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eSpecs\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 23.50 mm (0.925 in)\u003c\/li\u003e \u003cli\u003eShank: 1\/2\" (12.7 mm)\u003c\/li\u003e \u003cli\u003eMaterial: cobalt alloy (HSS-Co)\u003c\/li\u003e \u003cli\u003eType: Reduced shank drill bit\u003c\/li\u003e \u003cli\u003eQuantity: 1 piece\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eCobalt alloy provides improved heat resistance and wear life when drilling through hard metals compared to standard HSS.\u003c\/li\u003e \u003cli\u003eReduced shank design preserves a 1\/2\" shank while delivering a large cutting diameter.\u003c\/li\u003e \u003cli\u003eFlute geometry supports efficient chip evacuation and reduces walk when starting holes in metal.\u003c\/li\u003e \u003cli\u003eDurable construction suited for repeated drilling in fabrication, automotive, and metalworking projects.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003ePhysical\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eCutting diameter: 23.50 mm\u003c\/li\u003e \u003cli\u003eShank diameter: 1\/2\" (12.7 mm)\u003c\/li\u003e \u003cli\u003eMaterial: cobalt alloy drill bit (HSS-Co)\u003c\/li\u003e \u003cli\u003eConfiguration: reduced shank\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312681447703,"sku":"D\/AMMCO23.50","price":66.32,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_130b667b-df7e-4930-b40e-f4168cafa014.jpg?v=1771714949"},{"product_id":"24-00mm-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-ammco24-00","title":"24.00mm Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/AMMCO24.00","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 24.00 mm\u003c\/li\u003e \u003cli\u003eShank: 1\/2\" reduced shank\u003c\/li\u003e \u003cli\u003eMaterial: Cobalt drill bit (cobalt-based alloy)\u003c\/li\u003e \u003cli\u003eDesignation\/Model: D\/ACO\u003c\/li\u003e \u003cli\u003eQuantity: 1 piece\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eLarge-diameter cobalt bit designed for heavy metal drilling tasks\u003c\/li\u003e \u003cli\u003e1\/2\" reduced shank\u003c\/li\u003e \u003cli\u003eCobalt-based alloy offers improved heat resistance and wear life under demanding drilling\u003c\/li\u003e \u003cli\u003eCompact, robust construction suitable for repeated use in tough metalworking applications\u003c\/li\u003e \u003cli\u003e24 mm bore capability for large-diameter hole fabrication\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 24.00 mm\u003c\/li\u003e \u003cli\u003eShank: 1\/2\" reduced\u003c\/li\u003e \u003cli\u003eDesignation: D\/ACO\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312681578775,"sku":"D\/AMMCO24.00","price":63.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_cc872267-1147-4781-814b-ae2ae0449a99.jpg?v=1771714951"},{"product_id":"24-50mm-reduced-shank-cobalt-drill-bit-1-2-shank_d-ammco24-50","title":"24.50mm Reduced Shank Drill Bit | Cobalt | 1\/2\" Shank | D\/AMMCO24.50","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eProduct type: Cobalt drill bit\u003c\/li\u003e \u003cli\u003eShank: 1\/2\" shank\u003c\/li\u003e \u003cli\u003eReduced shank designation: 24.50 mm\u003c\/li\u003e \u003cli\u003eQuantity: 1 PC\u003c\/li\u003e \u003cli\u003eMaterial: Cobalt\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eCobalt material provides high heat and abrasion resistance, extending bit life when drilling hard metals.\u003c\/li\u003e \u003cli\u003eReduced 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Title","offer_id":52312681709847,"sku":"D\/AMMCO24.50","price":72.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_b3b3c255-84eb-4c80-b2f3-7887c9bb0e7c.jpg?v=1771714955"},{"product_id":"25-00mm-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-ammco25-00","title":"25.00mm Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/AMMCO25.00","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eSpecs\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 25.00 mm\u003c\/li\u003e \u003cli\u003eShank: 1\/2\\\" reduced shank\u003c\/li\u003e \u003cli\u003eMaterial: Cobalt alloy drill bit\u003c\/li\u003e \u003cli\u003eQuantity: 1 piece\u003c\/li\u003e \u003cli\u003eDesignation: D\/ACO\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eCobalt alloy construction delivers enhanced hardness and heat resistance for drilling through hard metals, including stainless steel and alloy steel.\u003c\/li\u003e \u003cli\u003e1\/2\\\" reduced shank design concentrates cutting diameter while providing a robust interface for high-torque drilling scenarios.\u003c\/li\u003e \u003cli\u003eOptimized geometry supports efficient chip evacuation and steady cutting, reducing heat buildup in tough alloys.\u003c\/li\u003e \u003cli\u003eHeavy-duty hole capability: designed for large-diameter holes where durability and long tool life are critical, helping minimize tool changes in production settings.\u003c\/li\u003e \u003cli\u003eSuitable for metalworking tasks requiring reliable performance in difficult metals and thick sections.\u003c\/li\u003e \u003cli\u003eDesignation D\/ACO indicates cobalt alloy family and intended use for large-diameter drilling tasks.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003ePhysical\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 25.00 mm\u003c\/li\u003e \u003cli\u003eShank: 1\/2\\\" reduced\u003c\/li\u003e \u003cli\u003eMaterial: Cobalt alloy\u003c\/li\u003e \u003cli\u003eDesignation: D\/ACO\u003c\/li\u003e \u003cli\u003eQuantity: 1 piece\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312682004759,"sku":"D\/AMMCO25.00","price":69.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_51b3efd6-a0fc-4bec-8f80-a62557d00ec9.jpg?v=1771714961"},{"product_id":"33-64-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-aco33-64","title":"33\/64\" Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/ACO33\/64","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 33\/64\" (0.5156\")\u003c\/li\u003e \u003cli\u003eShank: 1\/2\" Reduced Shank\u003c\/li\u003e \u003cli\u003eMaterial: Cobalt\u003c\/li\u003e \u003cli\u003eDesignation\/Model: D\/ACO\u003c\/li\u003e \u003cli\u003eQuantity: 1 PC\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eCobalt drill bit construction provides enhanced heat resistance and durability for demanding metal drilling tasks\u003c\/li\u003e \u003cli\u003e33\/64\" cutting diameter supports precise bore sizing in metalworking projects\u003c\/li\u003e \u003cli\u003e1\/2\" reduced shank delivers a compact shank profile within the bit’s overall design\u003c\/li\u003e \u003cli\u003eExplicitly designed for use in metal drilling environments where harder materials are common\u003c\/li\u003e \u003cli\u003eDesigned to maintain cutting efficiency under extended use with consistent feed and proper lubrication\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003ePack quantity: 1 PC\u003c\/li\u003e \u003cli\u003eProduct designation: 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\u003cli\u003eHigh-hardness cobalt alloy provides superior wear resistance when drilling hard metals such as stainless steel and alloy steels\u003c\/li\u003e \u003cli\u003eIncreased heat tolerance reduces edge softening and maintains cutting efficiency during high-speed drilling\u003c\/li\u003e \u003cli\u003e1\/2\" reduced shank geometry\u003c\/li\u003e \u003cli\u003eOne-piece construction minimizes wobble and improves hole accuracy in metalworking tasks\u003c\/li\u003e \u003cli\u003eIdeal for fabrication, automotive, and industrial metalworking scenarios requiring durable cobalt tooling\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eConstruction: Single-piece cobalt drill bit\u003c\/li\u003e \u003cli\u003eDiameter: 17\/32\"\u003c\/li\u003e \u003cli\u003eShank: 1\/2\" reduced shank\u003c\/li\u003e \u003cli\u003eMaterial: Cobalt alloy\u003c\/li\u003e \u003cli\u003eDesignation\/Series: D\/ACO\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312682299671,"sku":"D\/ACO17\/32","price":27.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_f017ac95-4943-4707-945f-a750aa7a86ae.jpg?v=1771714966"},{"product_id":"35-64-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-aco35-64","title":"35\/64\" Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/ACO35\/64","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCutting diameter:\u003c\/strong\u003e 35\/64 in (0.5469 in)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eShank diameter:\u003c\/strong\u003e 1\/2 in (reduced shank)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Cobalt drill bit (high-performance cobalt HSS alloy)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCoating:\u003c\/strong\u003e Uncoated\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDesignation:\u003c\/strong\u003e D\/ACO\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eProduct identification:\u003c\/strong\u003e This 1-piece cobalt drill bit (35\/64 in diameter) with a 1\/2 in reduced shank (D\/ACO).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-heat resistance:\u003c\/strong\u003e Cobalt alloy maintains hardness under elevated temperatures, extending bit life when drilling hard metals such as stainless steel and alloy steels.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eReduced shank design:\u003c\/strong\u003e 1\/2\" reduced shank provides secure engagement in standard tooling setups, helping minimize runout and stabilize hole location.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePrecision-ground edges:\u003c\/strong\u003e Sharp, evenly ground cutting surfaces reduce wandering and deliver cleaner hole finishes in tough materials.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUncoated cobalt chemistry:\u003c\/strong\u003e Hardness is preserved at high temperatures, enabling repeated use in demanding fabrication tasks.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIdeal use cases:\u003c\/strong\u003e Metalworking environments like automotive, fabrication, and tooling where larger-diameter holes in hard metals are routine.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOperational tip:\u003c\/strong\u003e For best results, use a steady feed rate and appropriate lubrication when drilling hard metals.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCutting diameter:\u003c\/strong\u003e 35\/64 in (0.5469 in)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eShank diameter:\u003c\/strong\u003e 1\/2 in (reduced shank)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Cobalt HSS alloy; uncoated\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDesignation:\u003c\/strong\u003e D\/ACO\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312682397975,"sku":"D\/ACO35\/64","price":28.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_304ecdef-b0b5-412b-bb42-ed6ca97961c5.jpg?v=1771714969"},{"product_id":"9-16-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-aco9-16","title":"9\/16\" Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/ACO9\/16","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 9\/16\" (0.5625\")\u003c\/li\u003e \u003cli\u003eShank: 1\/2\" reduced shank\u003c\/li\u003e \u003cli\u003eMaterial\/Coating: cobalt alloy\u003c\/li\u003e \u003cli\u003eDesign designation: D\/ACO\u003c\/li\u003e \u003cli\u003eQuantity: 1 piece\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCobalt alloy\u003c\/strong\u003e construction offers enhanced wear resistance and higher heat tolerance under demanding metal drilling tasks.\u003c\/li\u003e \u003cli\u003e1\/2\" \u003cstrong\u003ereduced shank\u003c\/strong\u003e design maintains a 9\/16\" cutting diameter while using a smaller shank profile for versatile mounting in compatible tooling configurations.\u003c\/li\u003e \u003cli\u003eDesign designation \u003cstrong\u003eD\/ACO\u003c\/strong\u003e indicates a tip geometry optimized for robust metal drilling and extended bite in hard metals.\u003c\/li\u003e \u003cli\u003eSingle-piece packaging simplifies procurement and inventory management.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 9\/16\" (0.5625\")\u003c\/li\u003e \u003cli\u003eShank: 1\/2\" reduced\u003c\/li\u003e \u003cli\u003eMaterial\/Coating: cobalt alloy\u003c\/li\u003e \u003cli\u003eDesignation: D\/ACO\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312682529047,"sku":"D\/ACO9\/16","price":27.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_c674b7e4-df62-4d9a-891d-499dbe9674e6.jpg?v=1771714971"},{"product_id":"37-64-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-aco37-64","title":"37\/64\" Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/ACO37\/64","description":"\u003cdiv\u003e\n\u003cp\u003eTechnical description for the [1 PC] 37\/64\" cobalt drill bit with 1\/2\" reduced shank, D\/ACO. This cobalt bit is engineered to tackle hard metals while delivering precise, larger-diameter holes with strong wear resistance and heat tolerance.\u003c\/p\u003e \u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 37\/64\" (0.578125\")\u003c\/li\u003e \u003cli\u003eShank: 1\/2\" Reduced Shank\u003c\/li\u003e \u003cli\u003eMaterial: Cobalt alloy\u003c\/li\u003e \u003cli\u003eQuantity: 1\u003c\/li\u003e \u003cli\u003eOverall length: not specified\u003c\/li\u003e \u003cli\u003eCoating: not specified\u003c\/li\u003e \u003cli\u003eDesignation: D\/ACO\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eCobalt alloy construction provides improved wear resistance and heat tolerance when drilling hard metals versus standard high-speed steel bits.\u003c\/li\u003e \u003cli\u003eReduced shank (1\/2\") enables integration with common 1\/2\" chuck systems without adapters.\u003c\/li\u003e \u003cli\u003eDesigned for larger-diameter holes with reduced risk of bit wandering under load.\u003c\/li\u003e \u003cli\u003eSuitable for metalworking tasks involving hardened steels, stainless steels, and alloyed metals where a larger-diameter hole is required.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 37\/64\" (0.5781\")\u003c\/li\u003e \u003cli\u003eShank diameter: 1\/2\"\u003c\/li\u003e \u003cli\u003eOverall length: not specified\u003c\/li\u003e \u003cli\u003eMaterial: cobalt alloy\u003c\/li\u003e \u003cli\u003eCoating: not specified\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312682660119,"sku":"D\/ACO37\/64","price":31.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_798b0022-ef89-4a71-8824-69e92184e5ed.jpg?v=1771714973"},{"product_id":"19-32-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-aco19-32","title":"19\/32\" Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/ACO19\/32","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eQuantity: 1 PC\u003c\/li\u003e \u003cli\u003eDiameter: 19\/32 in\u003c\/li\u003e \u003cli\u003eShank: 1\/2 in\u003c\/li\u003e \u003cli\u003eReduced Shank: 1\/2 in\u003c\/li\u003e \u003cli\u003eMaterial: Cobalt\u003c\/li\u003e \u003cli\u003eDesignation: D\/ACO\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eLarge-diameter cutting portion for bigger hole production in metal workloads (19\/32\").\u003c\/li\u003e \u003cli\u003eCobalt composition delivers higher hardness and wear resistance compared with standard high-speed steel bits.\u003c\/li\u003e \u003cli\u003eReduced shank design (1\/2\") maintains a larger bit body diameter for demanding metal drilling tasks.\u003c\/li\u003e \u003cli\u003eEngineered for improved heat tolerance during prolonged drilling in tougher metals.\u003c\/li\u003e \u003cli\u003eSingle 1 PC drill bit designed for demanding metal drilling tasks with improved heat tolerance.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eBit type: cobalt drill bit with reduced shank\u003c\/li\u003e \u003cli\u003eQuantity per pack: 1 PC\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312682725655,"sku":"D\/ACO19\/32","price":30.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_bd0505a8-a031-40be-ae77-93e8dd4014e0.jpg?v=1771714976"},{"product_id":"39-64-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-aco39-64","title":"39\/64\" Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/ACO39\/64","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eCutting diameter: 39\/64\" (0.609375\")\u003c\/li\u003e \u003cli\u003eShank diameter: 1\/2\" reduced shank\u003c\/li\u003e \u003cli\u003eDesignation: D\/ACO\u003c\/li\u003e \u003cli\u003eMaterial: cobalt alloy high-speed steel\u003c\/li\u003e \u003cli\u003eQuantity: 1 piece\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eReduced shank design paired with a 39\/64\" cutting diameter for efficient metal drilling in a compact shank footprint\u003c\/li\u003e \u003cli\u003eCobalt alloy construction offers enhanced heat resistance and wear life when drilling hard metals\u003c\/li\u003e \u003cli\u003ePrecision-ground tip for accurate starts and cleaner holes in stainless steel, alloy steels, and other tough materials\u003c\/li\u003e \u003cli\u003eDurable build suited for repeated drilling in demanding metalworking environments\u003c\/li\u003e \u003cli\u003eIdeal for metalworking tasks in repair, fabrication, automotive, and manufacturing settings\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eCutting diameter: 39\/64\" (0.609375\")\u003c\/li\u003e \u003cli\u003eShank diameter: 1\/2\" (reduced shank)\u003c\/li\u003e \u003cli\u003eMaterial: cobalt high-speed steel\u003c\/li\u003e \u003cli\u003eQuantity: 1 PC\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312682856727,"sku":"D\/ACO39\/64","price":31.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_81f4fddb-384b-46aa-9f72-dea60fe73d95.jpg?v=1771714979"},{"product_id":"5-8-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-aco5-8","title":"5\/8\" Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/ACO5\/8","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eCutting diameter: 5\/8\" (0.625\")\u003c\/li\u003e \u003cli\u003eShank diameter: 1\/2\" reduced shank\u003c\/li\u003e \u003cli\u003eMaterial: Cobalt high-speed steel (HSS) alloy\u003c\/li\u003e \u003cli\u003eModel\/Line: D\/ACO\u003c\/li\u003e \u003cli\u003eLength: not specified\u003c\/li\u003e \u003cli\u003eCoating: not specified\u003c\/li\u003e \u003cli\u003eIntended material focus: hard metals and alloys (e.g., stainless steel, high-strength steels)\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eEnhanced wear resistance and heat tolerance from cobalt alloy for longer bit life in demanding metalworking tasks\u003c\/li\u003e \u003cli\u003eCoarse 5\/8\" cutting diameter enables faster material removal in hard metals and alloys\u003c\/li\u003e \u003cli\u003e1\/2\" reduced shank provides a slimmer profile for versatile mounting and tighter access in fabrication setups\u003c\/li\u003e \u003cli\u003eGeometry optimized for drilling hard metals improves hole quality and reduces premature wear\u003c\/li\u003e \u003cli\u003eDesigned for repeated drilling in high-stress fabrication environments, supporting reliable performance\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eCutting diameter: 5\/8\" (0.625\")\u003c\/li\u003e \u003cli\u003eShank diameter: 1\/2\" reduced shank\u003c\/li\u003e \u003cli\u003eLength: not specified\u003c\/li\u003e \u003cli\u003eMaterial: cobalt HSS alloy\u003c\/li\u003e \u003cli\u003eCoating: not specified\u003c\/li\u003e \u003cli\u003eModel\/Line: D\/ACO\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312682955031,"sku":"D\/ACO5\/8","price":30.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_6c76338f-9d4d-44fd-8d00-f3985beebf0b.jpg?v=1771714981"},{"product_id":"41-64-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-aco41-64","title":"41\/64\" Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/ACO41\/64","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 41\/64 in (0.6406 in)\u003c\/li\u003e \u003cli\u003eShank: 1\/2 in Reduced Shank\u003c\/li\u003e \u003cli\u003eMaterial: Cobalt alloy\u003c\/li\u003e \u003cli\u003eQuantity: 1 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use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312683020567,"sku":"D\/ACO41\/64","price":35.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_4df28e12-67a6-40ef-82d8-5467e066c43c.jpg?v=1771714983"},{"product_id":"21-32-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-aco21-32","title":"21\/32\" Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/ACO21\/32","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 21\/32\" (0.65625\")\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eShank\u003c\/strong\u003e: 1\/2\" Reduced Shank\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Cobalt (HSS cobalt alloy)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePieces included\u003c\/strong\u003e: 1\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBrand\/Model\u003c\/strong\u003e: D\/ACO\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eCobalt composition provides improved heat resistance and longer wear life when drilling hard metals.\u003c\/li\u003e \u003cli\u003eReduced shank design offers a robust profile while maintaining a larger-diameter bit body in a compact shank section.\u003c\/li\u003e \u003cli\u003eRobust construction suited for stainless steel, alloy steels, and other hard materials.\u003c\/li\u003e \u003cli\u003eTwist geometry typical for metal drilling supports steady chip formation and hole accuracy.\u003c\/li\u003e \u003cli\u003eDesigned for demanding metalworking tasks where extended tool life matters.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eBit type\u003c\/strong\u003e: cobalt drill bit (twist geometry typical for metal 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\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 piece\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCutting diameter:\u003c\/strong\u003e 43\/64\" (0.671875\")\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eShank diameter:\u003c\/strong\u003e 1\/2\" reduced shank\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Cobalt drill bit (high-hardness alloy for metal cutting)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eModel\/code:\u003c\/strong\u003e D\/ACO\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCoating\/finish:\u003c\/strong\u003e cobalt alloy (uncoated primary cutting surface)\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eHigh-hardness cobalt composition delivers improved wear resistance and heat tolerance for metal drilling tasks\u003c\/li\u003e \u003cli\u003eLarge bore size with a 43\/64\" cutting diameter enables faster material removal on thick or hard metals\u003c\/li\u003e \u003cli\u003eSingle-piece packaging: 1 PC for ready-to-use replacement or project needs\u003c\/li\u003e \u003cli\u003eDurable design intended for tough drilling conditions typical in metal fabrication and maintenance shops\u003c\/li\u003e \u003cli\u003eModel\/code D\/ACO indicates the cutting geometry and intended metalworking applications\u003c\/li\u003e \u003cli\u003eDesigned for metalworking tasks where cobalt bits are advantageous for hard metals\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003ePhysical\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCutting diameter:\u003c\/strong\u003e 43\/64\" (0.671875\")\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eShank diameter:\u003c\/strong\u003e 1\/2\" (reduced)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCoating\/finish:\u003c\/strong\u003e cobalt alloy (uncoated primary cutting surface)\u003c\/li\u003e 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alloy\u003c\/li\u003e \u003cli\u003eLength: Not specified\u003c\/li\u003e \u003cli\u003eDesignation: D\/ACO\u003c\/li\u003e \u003cli\u003eQuantity: 1 PC\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312683282711,"sku":"D\/ACO11\/16","price":33.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_1a7e9fe2-88f9-4a08-8b77-c2a3b783a424.jpg?v=1771714990"},{"product_id":"45-64-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-aco45-64","title":"45\/64\" Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/ACO45\/64","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 45\/64\" (0.703125\")\u003c\/li\u003e \u003cli\u003eShank: 1\/2\" reduced shank\u003c\/li\u003e \u003cli\u003eMaterial: cobalt alloy\u003c\/li\u003e \u003cli\u003eDesignation: D\/ACO\u003c\/li\u003e 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piece\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eDesignation:\u003c\/b\u003e D\/ACO\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eEnhanced heat resistance and edge retention for drilling hard metals\u003c\/li\u003e \u003cli\u003eLarge-diameter hole option with a 1\/2\" reduced shank\u003c\/li\u003e \u003cli\u003eRobust cutting edge for metalworking applications such as stainless steel, alloy steel, and cast iron\u003c\/li\u003e \u003cli\u003eEfficient chip removal and stable performance at higher drilling speeds\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cb\u003eDiameter:\u003c\/b\u003e 25\/32\" (0.78125\")\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eShank:\u003c\/b\u003e 1\/2\" reduced\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003ePackage:\u003c\/b\u003e 1 piece\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eMaterial:\u003c\/b\u003e Cobalt drill bit (HSS-Co)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312683806999,"sku":"D\/ACO25\/32","price":42.26,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_1267f1a4-9d68-4a8e-8184-cb33ab55b01f.jpg?v=1771715005"},{"product_id":"51-64-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-aco51-64","title":"51\/64\" Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/ACO51\/64","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 51\/64\" (0.7969\")\u003c\/li\u003e \u003cli\u003eShank: Reduced to 1\/2\"\u003c\/li\u003e \u003cli\u003eMaterial: Cobalt drill bit\u003c\/li\u003e \u003cli\u003eDesignation: D\/ACO\u003c\/li\u003e \u003cli\u003eQuantity: 1 PC\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eCobalt alloy provides wear resistance and hot hardness for drilling harder metals\u003c\/li\u003e \u003cli\u003e51\/64\" cutting diameter enables a larger bore while maintaining edge geometry\u003c\/li\u003e \u003cli\u003e1\/2\" reduced shank\u003c\/li\u003e \u003cli\u003e tooling designation D\/ACO indicates its intended design and use case\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eCutting diameter: 51\/64\" (0.7969\")\u003c\/li\u003e \u003cli\u003eShank diameter: 1\/2\" (0.5\")\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312683872535,"sku":"D\/ACO51\/64","price":43.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_a05dcd6c-05b8-4bd0-8240-be54e110be3e.jpg?v=1771715007"},{"product_id":"13-16-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-aco13-16","title":"13\/16\" Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/ACO13\/16","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 13\/16 in (0.8125 in)\u003c\/li\u003e \u003cli\u003eShank: 1\/2 in reduced shank\u003c\/li\u003e \u003cli\u003eMaterial: Cobalt\u003c\/li\u003e \u003cli\u003eDesignation: D\/ACO\u003c\/li\u003e \u003cli\u003eOverall length: not specified\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eCobalt alloy construction delivers higher heat and wear resistance than standard high-speed steel, extending life when drilling hard metals.\u003c\/li\u003e \u003cli\u003eLarge cutting diameter (13\/16 in) combined with a 1\/2 in reduced shank enables use in tighter chucks while producing a sizable hole.\u003c\/li\u003e \u003cli\u003eOptimized for metalworking tasks involving hard metals such as stainless steel and alloy steels where conventional bits wear quickly.\u003c\/li\u003e \u003cli\u003eSuitable for metal fabrication, automotive work, and workshop applications requiring durable cobalt drilling capability.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eCutting diameter: 13\/16 in (0.8125 in)\u003c\/li\u003e \u003cli\u003eShank size: 1\/2 in reduced\u003c\/li\u003e \u003cli\u003eOverall length: not specified\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312683938071,"sku":"D\/ACO13\/16","price":42.26,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_f6ec966d-4074-48bd-84a9-447278a15845.jpg?v=1771715010"},{"product_id":"53-64-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-aco53-64","title":"53\/64\" Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/ACO53\/64","description":"\u003cdiv\u003e\n\u003cp\u003e1 PC cobalt drill bit, 53\/64 in diameter with a 1\/2 in reduced shank (D\/ACO). Designed for precision drilling in hard metals and extended bit life in demanding metalworking tasks.\u003c\/p\u003e \u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eDiameter:\u003c\/strong\u003e 53\/64 in (0.8281 in)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eShank:\u003c\/strong\u003e 1\/2 in reduced shank\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Cobalt\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDesignation:\u003c\/strong\u003e D\/ACO\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eCobalt composition provides improved heat resistance and wear life when drilling through hard metals compared with standard HSS bits.\u003c\/li\u003e \u003cli\u003eReduced 1\/2\" shank design preserves the larger cutting diameter for efficient material removal while allowing secure handling.\u003c\/li\u003e \u003cli\u003eEngineered for precision holes in tough materials, reducing wandering and extending bit life during demanding metalworking tasks.\u003c\/li\u003e \u003cli\u003eEffective for hard metals such as hardened steel, stainless steel, and alloy steels.\u003c\/li\u003e \u003cli\u003eNot intended for wood or non-metal materials.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eDiameter:\u003c\/strong\u003e 53\/64 in (0.8281 in)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eShank:\u003c\/strong\u003e 1\/2 in reduced shank\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312684036375,"sku":"D\/ACO53\/64","price":43.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_5d1a85ee-0e0c-44c5-8918-ecc014ca0a1f.jpg?v=1771715014"},{"product_id":"27-32-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-aco27-32","title":"27\/32\" Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/ACO27\/32","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 27\/32 in (0.84375\")\u003c\/li\u003e \u003cli\u003eShank: 1\/2 in reduced\u003c\/li\u003e \u003cli\u003eMaterial: Cobalt\u003c\/li\u003e \u003cli\u003eDesignation\/Model: D\/ACO\u003c\/li\u003e \u003cli\u003eQuantity per pack: 1 piece\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eCobalt construction provides improved wear resistance and heat tolerance for drilling tough metals.\u003c\/li\u003e \u003cli\u003eSolid, one-piece bit geometry designed for repeated drilling tasks in workshops and fabrication shops.\u003c\/li\u003e \u003cli\u003eReduced shank (1\/2 in) maintains bore diameter while accommodating tooling with a 1\/2 in shank.\u003c\/li\u003e \u003cli\u003eDesigned for precision in metalworking applications on stainless steel, alloy steel, and cast iron workpieces.\u003c\/li\u003e \u003cli\u003eRequires appropriate feeds and speeds to achieve optimal results on hard metals.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003ePackaging: 1 piece per order\u003c\/li\u003e \u003cli\u003eBody diameter: 27\/32 in\u003c\/li\u003e \u003cli\u003eShank type: 1\/2 in reduced\u003c\/li\u003e \u003cli\u003eDesignation: D\/ACO\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312684364055,"sku":"D\/ACO27\/32","price":45.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_dd86f244-abc6-454f-8ab7-d73c2276072f.jpg?v=1771715017"},{"product_id":"55-64-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-aco55-64","title":"55\/64\" Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/ACO55\/64","description":"\u003cdiv\u003e\n\u003cp\u003eTechnical description for the [1 PC] 55\/64\" cobalt drill bit with 1\/2\" reduced shank (D\/ACO).\u003c\/p\u003e \u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 55\/64\" (0.859375\")\u003c\/li\u003e \u003cli\u003eShank: 1\/2\" Reduced Shank\u003c\/li\u003e \u003cli\u003eShank type: Reduced\u003c\/li\u003e \u003cli\u003eDesignation: D\/ACO\u003c\/li\u003e \u003cli\u003eMaterial: Cobalt alloy\u003c\/li\u003e \u003cli\u003eQuantity: 1 piece\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eEnhanced wear resistance and heat tolerance typical of cobalt drill bits for hard metals and tough alloys\u003c\/li\u003e \u003cli\u003e1\/2\" reduced shank enables secure clamping and reduced slippage under high-load drilling\u003c\/li\u003e \u003cli\u003ePrecision cutting edges promote accurate hole diameters and longer bit life in demanding metalworking conditions\u003c\/li\u003e \u003cli\u003eCompact one-piece design minimizes runout and improves rigidity for through-hold drilling in stainless steels and alloy steels\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eMaterial: Cobalt alloy drill bit\u003c\/li\u003e \u003cli\u003eShank type: Reduced 1\/2\" shank\u003c\/li\u003e \u003cli\u003eDesign: One-piece construction\u003c\/li\u003e \u003cli\u003ePackage quantity: 1 piece\u003c\/li\u003e \u003cli\u003eOverall length: not specified\u003c\/li\u003e \u003cli\u003eTip geometry: not specified\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312684527895,"sku":"D\/ACO55\/64","price":51.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_52f9c3fd-6a35-475c-afcd-d57b05e783a5.jpg?v=1771715021"},{"product_id":"7-8-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-aco7-8","title":"7\/8\" Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/ACO7\/8","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 7\/8 in (0.875 in)\u003c\/li\u003e \u003cli\u003eShank: 1\/2 in Reduced Shank\u003c\/li\u003e \u003cli\u003eMaterial: Cobalt drill bit\u003c\/li\u003e \u003cli\u003eQuantity: 1 piece\u003c\/li\u003e \u003cli\u003eBrand\/Series: D\/ACO\u003c\/li\u003e \u003cli\u003eCoating: Not specified\u003c\/li\u003e \u003cli\u003eLength: Not specified\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eCobalt alloy construction provides higher heat resistance and edge retention than standard HSS, extending tool life when drilling hard metals.\u003c\/li\u003e \u003cli\u003e7\/8\" cutting diameter enables larger holes in steels and alloys, reducing secondary operations.\u003c\/li\u003e \u003cli\u003e1\/2\" reduced shank design allows use in smaller chucks\/collets while delivering the same cutting edge performance as a full-size shank.\u003c\/li\u003e \u003cli\u003eTip geometry and grinding optimized for controlled cutting and reduced walking on tough materials.\u003c\/li\u003e \u003cli\u003eDesigned for demanding drilling tasks in shop environments, including stainless steel, alloy steel, and cast iron.\u003c\/li\u003e \u003cli\u003eEffective with proper lubrication and appropriate feed rates to maximize performance and tool life.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eCutting diameter: 7\/8 in (0.875 in)\u003c\/li\u003e \u003cli\u003eShank diameter: 1\/2 in (reduced)\u003c\/li\u003e \u003cli\u003eCoating: Not specified\u003c\/li\u003e \u003cli\u003eOverall length: Not specified\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312684658967,"sku":"D\/ACO7\/8","price":49.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_50d3e2df-55c1-4a0d-828a-412363c07b7f.jpg?v=1771715024"},{"product_id":"57-64-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-aco57-64","title":"57\/64\" Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/ACO57\/64","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eDiameter: 57\/64 in (0.890625 in)\u003c\/li\u003e \u003cli\u003eMaterial: Cobalt alloy (HSS-Co)\u003c\/li\u003e \u003cli\u003eShank: 1\/2 in reduced shank\u003c\/li\u003e \u003cli\u003eQuantity: 1 piece\u003c\/li\u003e \u003cli\u003eDesignation: D\/ACO\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eEnhanced heat resistance from cobalt alloy, helping maintain hardness during drilling of hard metals\u003c\/li\u003e \u003cli\u003eReduced shank design preserves cutting-edge geometry under heavy cutting loads, supporting larger-diameter operations\u003c\/li\u003e \u003cli\u003eLonger wear life when drilling stainless steel and other hard alloys, reducing tool changes in demanding fabrication work\u003c\/li\u003e \u003cli\u003eIdeal for stainless steel, alloy steels, and other hard metals commonly encountered in metal fabrication and repair tasks\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eBit type: cobalt drill bit with reduced shank\u003c\/li\u003e \u003cli\u003eDiameter: 57\/64 in\u003c\/li\u003e \u003cli\u003eShank diameter: 1\/2 in\u003c\/li\u003e \u003cli\u003ePackage quantity: 1 piece\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312684757271,"sku":"D\/ACO57\/64","price":57.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_589374ff-1561-4cea-b4b8-c60a6dc190ee.jpg?v=1771715026"},{"product_id":"29-32-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-aco29-32","title":"29\/32\" Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/ACO29\/32","description":"\u003cdiv\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 29\/32\" (0.90625\")\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eShank\u003c\/strong\u003e: 1\/2\" reduced\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Cobalt alloy\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDesignation\u003c\/strong\u003e: D\/ACO\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eQuantity\u003c\/strong\u003e: 1 PC\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eWear and heat resistance\u003c\/strong\u003e: Cobalt alloy provides enhanced heat tolerance and wear resistance, extending tool life when drilling hard metals.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eLarge-diameter efficiency\u003c\/strong\u003e: 29\/32\" diameter enables faster through-holes in thick or hard workpieces such as stainless steel, alloy steel, and cast iron.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eShank design\u003c\/strong\u003e: 1\/2\" reduced diameter maximizes clearance in tight setups.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUse case\u003c\/strong\u003e: Designed for heavy-duty metalworking tasks in fabrication, maintenance, and repair workflows requiring a single large-diameter cobalt bit.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOperational tip\u003c\/strong\u003e: Use slower spindle speeds with adequate lubrication when drilling hard metals to maximize life.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eOverall diameter\u003c\/strong\u003e: 29\/32\" (0.90625\")\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eShank diameter\u003c\/strong\u003e: 1\/2\"\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eModel\u003c\/strong\u003e: D\/ACO\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312684855575,"sku":"D\/ACO29\/32","price":55.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_7de4b132-75a6-41fa-87aa-ae7b921cea30.jpg?v=1771715029"},{"product_id":"59-64-cobalt-drill-bit-with-1-2-reduced-shank-d-aco_d-aco59-64","title":"59\/64\" Reduced Shank Drill Bit | Cobalt | 1\/2\" Reduced Shank | D\/ACO59\/64","description":"\u003cdiv\u003e\n\u003cp\u003eTechnical description for the 1 PC 59\/64\" Cobalt Drill Bit with 1\/2\" Reduced Shank, D\/ACO.\u003c\/p\u003e \u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cb\u003eDiameter\u003c\/b\u003e: 59\/64\" (23.42 mm)\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eShank\u003c\/b\u003e: 1\/2\" reduced (12.70 mm)\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eMaterial\u003c\/b\u003e: Cobalt (D\/ACO designation)\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eQuantity\u003c\/b\u003e: 1 piece\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eLarge-diameter cutting edge enables rapid hole creation in metal workpieces.\u003c\/li\u003e \u003cli\u003e1\/2\" reduced shank provides a compact profile with a large cutting diameter.\u003c\/li\u003e \u003cli\u003eCobalt construction delivers higher hardness and heat resistance than standard HSS bits.\u003c\/li\u003e \u003cli\u003eSingle-piece design for immediate installation without assembly.\u003c\/li\u003e \u003cli\u003eGeometry (D\/ACO) optimized for metalworking tasks requiring a 59\/64\" hole diameter.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePhysical\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cb\u003eDiameter\u003c\/b\u003e: 59\/64\" (23.42 mm)\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eShank\u003c\/b\u003e: 1\/2\" reduced (12.70 mm)\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eQuantity\u003c\/b\u003e: 1 piece\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":52312684953879,"sku":"D\/ACO59\/64","price":57.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/1125\/5063\/files\/d-ammco13-50_96c82c94-d05a-48fd-8d36-b223c53f8cc5.jpg?v=1771715031"}],"url":"https:\/\/mutualscrew.com\/collections\/cobalt-reduce-shank-drill-bits.oembed?page=3","provider":"Mutual Screw \u0026 Supply","version":"1.0","type":"link"}