When your trailer is not in storage or not in use, Reese Coupler Locks prevent theft and keep your trailer more secure than with weaker locks. Adjustable Coupler Lock Comes with a 3/16 pin that fits most couplers. It adjusts from 5/8 to 3. Features a swivel head with front access. Towpower Brass Coupler Lock Features a flat key design and is constructed of corrosion-resistant brass. Includes two keys. Universal Coupler Storage Lock Heavy-duty die cast steel construction. Ratcheting design with 11 locking positions and fits: 1-7/8, 2, and 2-5/16 couplers. Towpower Universal Coupler Lock Bright yellow deters thieves. Works on standard, straight, rolled, Bulldog, and surge brake couplers. Designed to fit 1-7/8, 2, and 2-5/16 couplers. Manufacturers 1-year limited warranty. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Color: Bright yellow. Type: Trailer Hitches & Accessories.