Trimax TR200 Deluxe 5/8" Key Receiver Lock - Bent Pin style The 5/8" pin fits all Class 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 Protective rubber cap protects keyhole from water, grime and dirt Standard bent pin style with single barbell head lock