Features Universal Compatibility: This hitch lock set is compatible with most III IV class, 2 inch and 2-1/2 inch receivers. Suitable for trailers, trucks, cars, cyclings, and boats. Diameter 5/8 inch, 4 inch long pin lock for secure towing Press Lock Design: Featuring a press locking design, this trailer hitch lock is easy to operate. Simply push to lock without needing a key. Turn the key slightly, and the locking pin automatically out Sturdy Structure: Made with solid steel and black electrophoretic paint for durability. Can withstand up to 30000 lbs weight. The zinc alloy tube lock cores and anti theft design can resist different types of external forces Rubber Cover: Using weather proof rubber cover to prevent the lock is affected by the bad weather, aimed at preventing road debris from entering the locking mechanism during long distance travel, ensuring durability and reliability Rubber Rings: This trailer hitch lock has shock absorbing rubber washers, providing you with stable and quiet travel; Equipped with 4 detachable O rings, allowing you to customize the distance and ensure a tight fit Item Type: Trailer Hitch Lock Model: TYTCS100 Material: Zinc Alloy Overall Length: Approx. 189mm / 7.4in Pin Length: Approx. 100mm / 4in Pin Lock Diameter: 5/8 inch (16mm) Lock Head Diameter: Approx. 29.5mm / 1.2in Lock Body Diameter: Approx. 25mm / 1in Package List: 1 x Trailer Hitch Lock 4 x O Rings 2 x Keys Notice: There is a slight error in size. Package List 1 x Trailer Hitch Lock 4 x O Rings 2 x Keys