Lock a trailer, bike rack, mower, or hitch mounted setup instead of relying on a plain hitch pin. 5/8 inch pin with rubber fillers fits receivers from 2 inches up to 3 5/8 inches across Class I, II, III, and IV hitches. Rubber fillers help improve fit and reduce rattle at the receiver. Rubber key slot cover helps shield the lock from rain, snow, salt, and road grime. Reinforced carbon steel construction is built for towing and outdoor use. More Details 5/8 inch lockable hitch pin. 3.5 inch active length. Fits receivers from 2 inches up to 3 5/8 inches with the included rubber fillers. Class I, II, III, and IV trailer hitches. Includes safety cotter pin, rubber fillers, tubular pin lock, and rubber key slot cover. Reinforced carbon steel with marine grade powder coating. DescriptionBetter Boat Lockable Hitch Pin Lock helps secure a tow setup, trailer, bike rack, mower, or other hitch mounted gear. It is a 5/8 inch locking pin with a 3.5 inch active length and compatibility for 2 inch and 2.5 inch receivers.The reinforced carbon steel construction, black coating, rubber fillers, and rubber key slot cover are designed for demanding outdoor use. Use it when you want a locking connection instead of a standard pin.