Heavy Duty, Trailer Coupler Lock, Fits 2-5/16" Coupler, Laminated Steel Construction, Advanced Locking Mechanism, Resists Against Picking & Prying, Keyway Cover Protects Lock From Moisture & Dirt, Keyed Alike Trailer Coupler Latch Lock Included, Used For Automotive & Towing Trailers, Vans & Moving Trucks Marine Recreation.