Security fasteners are specialized screws, bolts, and nuts that use proprietary drive patterns — including spanner, pin-in six lobe, one-way, tri-groove, and pin-in hex socket — that require non-standard tools for installation or removal. This deters tampering, vandalism, and theft in public and commercial environments. We stock tamper resistant machine screws, sheet metal screws, self-drilling screws, cap screws, break-away nuts, spanner nuts, and the matching driver bits, keys, sockets, and handles to install them. Materials include 18/8 stainless steel, brass, alloy steel, and zinc plated steel across a full range of imperial sizes.