Master LockA(R) has been supplying peace of mind and security to the world for decades. As the largest global manufacturer and marketer of locks, Master LockA(R) has made it their goal to continually recreate and upgrade their design, since the 1920&&';;s. Offering your family, and your gear, a secure product that boasts innovation, quality, and compelling value. Fits 1-7/8", 2" and most 2-5/16" trailer couplers Easy to install and remove Resists rust and corrosion Hardened steel Provides maximum protection and resists picking and prying Best Used For: Automotive & Towing Trailers, Vans & Moving Trucks Marine Recreation