BOLT Receiver Lock For GM New Models Opens With Your Vehicle Ignition Key Works with center cut Chevy, Buick & GMC keys Stainless Steel 5/8″ Diameter Shaft Fits Class 3, 4 and 5 Hitches (2-2.5″ 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