Opens With Your Vehicle Ignition Key -- Stainless Steel 1/2" Diameter Shaft -- Fits Class 1 and 2"Hitches (1-1.5" square receiver) -- Weather Proof -- Auto Return Spring Locks Automatically When Key is Removed -- Double Ball Bearing Locking Mechanism -- Plate Tumbler Sidebar to Prevent Picking and Bumping -- Stainless Steel Lock Shutter to Keep Out Dirt and Moisture -- Limited Lifetime Warranty