Security bolt is a tamper‑resistant fastener with special non‑standard drive head, such as pin‑in‑Torx, spanner, tri‑wing, pentagonal head and one‑way drive. It can only be installed and removed by matching special tools, which prevents unauthorized disassembly, vandalism and theft. Material: carbon steel, stainless steel 304 / 316. Finishes: blue‑white zinc plated, color zinc plated, hot‑dip galvanized, natural passivation. Widely used for public facilities, street lamps, traffic signs, electrical cabinets, manhole covers, vending machines and outdoor equipment to avoid malicious dismantling.