TOPTOW is a well experienced manufacturer of towing accessories. We only craft products with the best quality. TOPTOW dogbone hitch pin lock is with 1/2" hitch pin diameter and 5/8" steel sleeve, can fit most ball mounts with a 1/2" and 5/8” pin hole. The lock pin's usable active length is 2-3/4" span. The locking pin is made of one piece solid hardened steel, strong and durable. All-weather rubber key slot cap keeps the key hole away from rain, snow, moisture, dust, rust, protecting the internal lock mechanism. Package includes 1x 1/2" diameter lock pin and 5/8" sleeve adaptor,1x lock head, 1 x rubber cap, 2 x tubular round keys. This dogbone style receiver lock is compatible with hitch rack, cargo hitch tray, bike rack, hitch ball and tow rope, ensure the towing safety.