The 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 shackle, and use the included key to lock into place. Easy to install, provides a tight and secure fit, and is made of corrosion-resistant materials designed to withstand extreme weather. The bright red finish is highly visible to discourage others from tampering with your trailer.