TheKryptonite KryptoLok Standard U-Lock is made of a 13mm hardened Performance steel shackle that resists cutting and leverage attacks.New patent pending hardened double deadbolt design gives additional protection against twist attacks. Complete solution - use the 4' cable to secure front wheel or accessories. Kryptonite KryptoLok Standard U-Lock Features High security disc-style cylinder is pick and drill resistant Anti-rattle bumpers reduce noise during transport Includes Transit FlexFrame-U transportation system which allows for versatile carrying Protective vinyl coating 2 stainless steel keys Key Safe Program Optional ATPO - £1,000 Product dimensions: 4” x 9” (10.2cm x 22.9cm) Product weight: 3.65 lbs (1.66 kgs) Sold Secure Bicycle Gold certified