Enjoy your towing journey with our MaxxHaul 50186 trailer coupler lock. It is constructed from high-stength steel with chrome finish to resist rust and corrosion and handle all types of weather conditions. The kit includes diameter 1/4" locking pin, 360º rotating lock head all-weather rubber cap, and 2 flat keys for maximum security to help tighten in place. The lock is adjustable with 4 different active lengths: 1", 1-7/10", 2-1/2", and 3". It is easy to operate with a user-friendly push-to-lock design without using the key. It is suitable use for 1" to 3" latch-type couplers for towing, boat, truck, and RV.