Key Features:16mm hardened MAX-Performance steel shackle,Patented pending hardened double deadbolt design gives additional protection against twist attacks,Highest security disc-style cylinder is pick and drill resistant,Protective vinyl coating,Sliding dustcover protects cylinder from the elements,Includes Transit FlexFrame-U transportation system which allows for versatile carrying,3 stainless steel keys one lighted with high intensity LED bulb & replaceable battery,Key Safe Program,Rated 9/10 on Kryptonite's security scale,Optional ATPO - £ 2,500,Product dimensions: 4 x 8" (10.2cm x 20.3cm),Product weight: 4.45 lbs (2.02 kgs),Sold Secure Bicycle Gold certified.