Guard Security 242 discus stainless steel padlock. Stainless steel body for rust resistance and strength. Spring-less positive lock latch. Lock crushes closed when attacked with hammer. Fully chrome plated thru-hardened solid steel shackle resists cutting, sawing, prying and hammer attacks. Solid brass cylinder and pins with solid brass plug. Lock is fully re-key able and interchangeable. Each Guard Security padlock is individually tested at the factory to ensure smooth performance before packaging. Rust resistant nickel plated brass keys and common keyway for duplication. AM3/5JU2 keyway.