The TowSmart Steel Barrel Style Trailer Hitch Lock protects your boats, campers, trailers, and equipment from theft by inserting the pin into the fastener hole once you have positioned the ball mount or hitch accessory in the receiver hitch. The hitch pin has a sleeved design that fits 1/2 In. and 5/8 In. receiver holes. It provides a tight and secure fit, and is made of corrosion-resistant materials designed to withstand extreme weather. Includes weather-resistant dust caps that protect the locking mechanism from moisture, and 2 keys. This product is not recommended to remain on vehicles for an extended period of time.