This heavy-duty trailer coupler lock offers excellent security for RVs, trailers, and boats, fitting 1-7/8, 2, and 2-5/16 inches straight tongue ball couplers. Made of durable carbon steel, it resists tools like crowbars and drills. The powder-coated surface and all-copper lock cylinder avoid rust, while the lock is easy to install and comes with 4 keys for added convenience. | Vevor | | Trailer Lock, Fits 1-7/8, 2 & 2-5/16-Inch Straight Tongue Ball Couplers, Heavy Duty Hitch Lock with 4 Keys | Orange | Best Buy