The TowSmart Universal Coupler Lock protects your boats, campers, trailers, equipment and other valuable assets from theft. The Coupler Lock is designed to fit 1-7/8 in, 2 in., and 2-5/16 in. couplers and provides multiple locking positions. Simply slide the ball into the coupler, connect the bright red shackle, and use the included key to lock into place. It is easy to install, provides a tight and secure fit and is made of corrosion-resistant materials designed to withstand harsh weather conditions. The bright red finish on the TowSmart Universal Coupler Lock is highly visible to discourage others from tampering with your trailer.