Feature: 1. [Universal Compatibility] The 5/8 inch diameter pin hitch lock is designed to fit most Class III and IV 2 inch and 2 1/2 inch hitch receivers, suitable for trailers, trucks, cars, and boat. 2. [Easy to Operate] Featuring a press to lock mechanism, simply push to lock without using a key, turn the key slightly, and the locking hitch pin will automatically pop out. 3. [Secure Construction] The lock is made of solid steel and black electrophoretic paint, very sturdy and can handle up to 30,000 pounds, the core is made of zinc alloy tube, ensuring long lasting use. Anti theft design, can resist different types of external forces. 4. [Weather Resistant] The trailer receiver lock features weatherproof rubber cover to guard the lock from harsh weather conditions, prevents road debris from entering the locking mechanism during long distance travels. 5. [Shock Absorbing] Includes 4 removable O rings for stable and quiet travels, allowing you to customize the distance and ensure a tight fit. Specification: Item Type: Trailer Hitch Lock Material: Zinc Alloy Model: TYTCS120 Total Length: Approx. 217mm / 8.54in Pin Length: Approx. 120mm / 4.72in Pin Lock Diameter: Approx. 16mm / 5/8in Lock Head Diameter: Approx. 29.5mm / 1.16in Lock Tail Diameter: Approx. 25mm / 0.98in. Package List: 1 x Trailer Hitch Lock 4 x O Rings 1 x Key Insert 2 x Keys Note: Size may have deviation.