Feature:1. Multipurpose Protection: Effectively secure your trailers, cargo haulers, and RVs with this gooseneck trailer hitch lock, deterring theft and unauthorized movement, ensuring peace of mind and safety during transportation.2. Robust Construction: Built with high strength zinc alloy, aluminum and steel, our lock withstands oxidation, and damage, promising long lasting reliability and durability, making it an indispensable safety companion on your journeys.3. Convenient Security: Featuring a user friendly combination lock with a high security combination, this lock enhances protection, eliminating the hassle of lost keys, and allowing for effortless trailer coupling, safeguarding your ride.4. Easy Installation: Simply position the lock around the base of your coupler, with the narrow end of the lock fitted over the coupler bracket near the handle. Then insert the 3/4in diameter steel pin through the holes in the lock and secure the pin in place with the included padlock.5. Universal Compatibility: Gooseneck coupler lock is designed for trailers, livestock haulers, and RVs, this lock ensures compatibility with a wide range of vehicles, providing universal protection.Specification:Item Type: Trailer Hitch LockMaterial: Zinc alloy + aluminum + steelDimensions: 11 x 6-1/4 x 4-1/2in (Length x Width x Height)Pin Diameter: 3/4inWeight: 7 lbsApplication: Simply position the lock around the base of your coupler, with the narrow end of the lock fitted over the coupler bracket near the handle. Then insert the 3/4in diameter steel pin through the holes in the lock and secure the pin in place with the included padlock.Applicable Models: For Heavy Trailers Livestock Haulers and RVs.Package List:1 x Gooseneck Lock1 x Hitch Pin1 x Combination Lock1 x User Manual