TRIMAX Twister Series 5/8" Receiver Hitch Pin Lock. The TK225 features dual twisting lock head and end portion that makes the lock resistant to saw cuts. Provides instant security for your camper, boat or trailer by securing your vehicle receiver hitch. Features patented 1/4 turn technology that cannot be false locked. The 5/8" pin fits all 2" Class III, IV and V receiver hitches. Comes with a weather protective cap and Type E key which is a European styled flat key providing excellent security. Premium chrome plated finish with knurling on end portion adds style and grip. Width between heads (exposed pin length) is 2 5/8".