The TowSmart Boomerang Locking Hitch Pin protects your boats, campers, trailers, equipment, and other valuable assets from theft. It easily secures your ball mount or hitch accessories to the receiver hitch. Simply insert the pin into the fastener hole once you have positioned the ball mount or hitch accessory in the receiver hitch. The Boomerang Hitch Pin offers a patented, reversible dual diameter design that fits 1/2in receiver holes. It provides a tight and secure fit, and is made of corrosion-resistant materials designed to withstand harsh weather conditions. Weather resistant dust cap protects the locking mechanism from moisture and dirt build up. This product is not recommended to remain on vehicles for an extended period of time. Includes 2 keys.