Opens With Your Vehicle Ignition Key -- Works with early model Chevy & GMC keys -- Stainless Steel 5/8" Diameter Shaft -- 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