Threaded hitch pin, includes washers and clip. Size: 1/2"-13 TPI Length: 4-1/8" (104mm) *Used on current Hollywood Racks that use a threaded hitch pin. 1/2-20, part number HPN-20 was used in the early 2000's and prior. Locking Threaded Hitch Pins are also available, they come with or without a keyed alike 8’ cable. Locking Threaded Hitch Pin, Model No. LHPT Locking Threaded Hitch Pin with cable, Model No. LHPTC