TRIMAX 5/8" Receiver Hitch Locking Pin part # T3BLK is used to secure the receptacle part of a trailer hitch (attached to a vehicle) to inserts such as ball mounts, drawbars, accessory carriers or ornamental receiver plugs. The T3 features a black epoxy powder coat finish and hardened steel and 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. This 5/8" pin fits all Class III, IV and V receiver hitches and comes with a Type A, spring loaded, 7 pin, high security key. This rugged and durable key resists attempted drill outs and will not bend or break. TRIMAX makes the worlds toughest locks and offers a lifetime warranty on all of their products.