The TowSmartA(R) Steel Boomerang Hitch Pin keeps your boats, campers, trailers and other valuable equipment from walking off on you. This quick and easy theft-deterrent features a unique patented boomerang design that allows it to work in two different diameter trailer hitch receivers. Just insert the pin into the fastener hole once you have positioned the ball mount or hitch accessory in the receiver hitch and you're good to go. Protect your boats, campers, trailers, equipment, etc. from theft Unique, patented boomerang design Fits 1/2" and 5/8" trailer hitch receivers Simply insert the Pin into the fastener hole Works for Class I-IV Corrosion-resistant finish Order today!