This is a 5/8" diameter 4-3/8" span extended hitch receiver lock. It provides immediate security for your camper boat or trailer by securing your vehicle receiver hitch. O-ring seal and watertight cap help seal out dirt and corrosion 1/4 turn locks and unlocks the head The lock won t pop open or be false locked High quality keys won t bend or break Warning: Product may contain materials cautioned by California Proposition 65.