Features Universal Compatibility: This hitch lock set is compatible with most III IV class, 2 inch and 2-1/2 inch receivers. Diameter 5/8 inch, 3 inch long pin for secure towing, suitable for trailer, truck, car, cycling, and boat Press Lock Design: Featuring a press type locking design, this trailer hitch lock is convenient to operate. Simply push to lock without needing a key. Turn the key slightly, and the locking pin automatically out Sturdy Structure: The trailer hitch lock is made of solid steel and black electrophoretic paint, ensuring a sturdy and stable structure that can support up to 30000 pounds, which is twice the weight of a regular pin lock Zinc Alloy Tube: The part of the hitch lock is made of zinc alloy tube, which is sturdy and rustproof; The hitch pin lock with anti theft design can resist different types of external forces, suitable for various environments 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 journey, ensuring durability and reliability Spec: Item Type: Trailer Hitch Lock Material: Zinc Alloy Overall Length: Approx. 174mm / 6.9in Pin Length: Approx. 76.2mm / 3in Pin Lock Diameter: 5/8 inch (16mm) Lock Head Diameter: Approx. 29.5mm / 1.2in Lock Tail Diameter: Approx. 25mm / 1in packing list: 1 x Trailer Hitch Lock 2 x Keys Note: Size may have an error. Package List 1 x Trailer Hitch Lock 2 x Keys