The Steel Receiver Lock 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 by inserting the pin into the fastener hole once you have positioned the ball mount or hitch accessory in the receiver hitch. The receiver lock has a 5/8 In. pin diameter and is designed to work with Class III and Class IV receivers and ball mounts. 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 dirt build up, and 2 keys. This product is not recommended to remain on vehicles for an extended period of time.