Trimax SXTS32 Universal Premium 100% Stainless Steel Receiver Lock - fits 1/2" and 5/8" This universal pin fits all Class II, III, IV and V receiver hitches O-ring keeps water, grime and dirt out of locking mechanism to ensure years of use Protective rubber cap protects keyhole from water, grime and dirt Type A key which is a spring loaded, 7 pin, high security key. Resists attempted drill outs. Rugged and durable, the key will not bend or break. Includes 2 keys