The universal Master Lock provides a strong level of protection for trailers and valuable equipment. It is designed to secure around the coupling device, preventing it from being attached and towed. Features a universal fit suitable for cars, trailers, and RVs. Compatible with couplers sized 1-7/8 inches, 2 inches, and 2-5/16 inches. Built with a durable zinc base that resists weather, rust, and corrosion. The reinforced locking mechanism effectively guards against tampering and picking, while the thoughtfully designed keyhole prevents dirt and debris from entering.