ULTIMATE COMPATIBILITY: The Rvdeea Gooseneck Trailer Lock fits most round tube gooseneck couplers. Gooseneck locks are carefully designed to fit most trailers EXCELLENT STRENGTH AND SAFETY: The gooseneck lock features a hidden padlock design that resists cutting, drilling and other tampering methods. With it, you will never have to worry about problems such as theft or loss of your trailer EASY INSTALLATION: Simply spread our trailer lock, install it on your trailer and finally lock it with the included locking mechanism THICKENED HEAVY DUTY STEEL: This gooseneck trailer lock, made of sturdy alloy steel, is weatherproof enough to withstand harsh weather conditions and last for years CUSTOMER SERVICE: Please measure the size of your trailer before purchasing and confirm the fitment for your trailer according to our lock dimensions. If you have any questions about Rvdeea products, please feel free to contact our customer service, we will solve your problem as soon as possible The Rvdeea Gooseneck Trailer Lock fits most round tube gooseneck couplers. Gooseneck locks are carefully designed to fit most trailers