The Brass 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 designed to withstand extreme weather. The plastic mold on the TowSmart Coupler Lock is highly durable and protects against marring and scratching. Includes 2 keys. This product is not recommended to remain on vehicles for an extended period of time.