Universal Coupler Trailer Locks Adjustable Security Ball Hitch Trailer Hitch Lock Fits 1-7/8 Inch 2 Inch 2-5/16 Inch Couplers

Product descriptions from the supplier
Trailer hitches are made from Al-Mg alloy, which is the same lightweight materialused to build space shuttles. Rest assured the product is manufactured with thefinest materials and durable structures. The polished aluminum frame won’t rust,crack or flake off. Silver color design makes your truck look fantastic.