TRIMAX 5/8" Receiver Hitch Locking Pins part # TH43 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. TH43 provides instant security for your camper, boat or trailer by securing your vehicle receiver hitch. This kit includes 2 pins, one that fits standard 2" receivers and one that fits rapid hitch adjustable systems with 4 1/2" gap. These 5/8" pins fit all Class III, IV, V, and 2x2 receiver hitches and comes with matching Type A, spring loaded, 7 pin, high security keys. 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.