13mm hardened Performance steel shackle resists cutting and leverage attacksKey Features:New patent pending hardened double deadbolt design gives additional protection against twist attacks,High security disc-style cylinder is pick and drill resistant,Anti-rattle bumpers reduce noise during transport,New dust cover,Includes Transit FlexFrame-U transportation system which allows for versatile carrying,Protective vinyl coating,2 stainless steel keys,Key Safe Program,Rated 6/10 on Kryptonite’s security scale,Optional ATPO - £1,000,Product dimensions: 4” x 9” (10.2cm x 22.9cm),Product weight: 2.9 lbs (1.32 kgs),Sold Secure Bicycle Gold certified.