The Trimax 5th Wheel King Pin Lock is maximum security for your unattended 5th wheel trailer. It is constructed of ultra-tough fully hardened steel, designed to resist all hammer strikes. Its rugged weatherproof epoxy powder coat prevents rust and corrosion. The 5th Wheel King Pin Lock is easy to Install with a simple 1/4 turn to release lock core, slide unit up over King Pin, push lock core back in, to lock into place. It features a full collar design that keeps grease off your hands.