The TowSmart Heavy-Duty Coupler Lock Kit comes complete with the necessary theft-deterring locking accessories. The Heavy-Duty Coupler lock is designed to fit all coupler styles and types and uses a round key lock for greater security. The Boomerang Hitch Pin offers a patented, reversible dual diameter design that fits 1/2 in. and 5/8 in. receivers. It provides a tight and secure fit, and is made of corrosion-resistant materials designed to withstand harsh weather conditions. The Boomerang Hitch Pin combined with Coupler Lock protects your boats, campers, trailers, equipment, and other valuable assets from theft. The Coupler Lock secures the trailer to the ball mount when in tow and provides superior protection to the trailer when it is left unattended. This product is not recommended to remain on vehicles for an extended period of time. Includes 4 keys that are keyed alike for convenience rather than having multiple keys. Material: Steel.