RETRUE Trailer Hitch Lock Design: 5/8 Inch diameter trailer hitch lock pin with Super Extra Long Effective Length 2 3/4 Inch. Specially for big towing vehicle, truck, 2" hitch receiver or Class III IV hitches. Notice: It not compatible with double-walled receiver tubes. (Please make sure of the size of the lock or email us for more information before placing an order)Durability: The lock cylinder is made of high quality zinc alloy tubular. Its anti-theft design can resist huge impacts from different kinds of external forces. Adapted rubber key slot cap is all-weather proof keeps keyhole safe and cleanEasy to Install and Use: This hitch lock keeps your trailer hitch securely locked, giving you peace of mind wherever you goThe Fitment of Locking Hitch Pin: Class III IV Hitches, Hitch Bike Rack Tray Ball Tow Rope for Trailer Truck Car BoatWhat Will You Get: The pin lock covered with high quality solid steel and black electrophoretic paint. It is quite strong and withstand 30,000 lbs, twice as much as a regular pin lock. Come with 4 noise reducing rubber rings. It is from RETRUE Your reliable partner. 24/7