Durable Steel Trailer Coupler Lock: Reliable Anti-Theft Solution This robust trailer coupler lock is designed to provide reliable security for RVs, trailers, and boats, accommodating 2-5/16 inch cast or bulldog couplers. Constructed from sturdy carbon steel, it withstands tampering attempts with tools such as crowbars and drills. The powder-coated finish and 304 stainless steel lock core ensure resistance to corrosion, while the lock's straightforward installation process and inclusion of three keys enhance user convenience. Designed to match your coupler seamlessly Durable and Secure Construction Effortless and Convenient Locking Mechanism Built to Last and Resistant to Corrosion Dependable Security Solution Key Features Secure Your Trailer: Designed to fit 2-5/16-inch (58.6 mm) cast or bulldog-style couplers, this lock provides reliable protection for your trailer or RV. Please verify your coupler size before purchasing. Durable Anti-Theft Construction: Crafted from robust carbon