The Chrome Adjustable 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. It is designed to fit 1-7/8 In., 2 In., and 2-5/16 In. couplers. It is easy to install, provides a tight and secure fit, and is made of corrosion-resistant materials to withstand extreme weather. It includes a dust cover to protect the lock from corrosion build up and 2 keys. This product is not recommended to remain on vehicles for an extended period of time.