Built to defeat both bolt cutter and leverage attacks, the Kryptonite KryptoLok U Lock provides a high level of security for your bike in urban areas. 13 mm hardened Performance steel shackle resists cutting and leverage attacks. Reinforced hardened cross bar design provides increased protection. High security, disc style cylinder. Anti rattle bumpers reduce noise during transport. Protective vinyl coating rotating dustcover protects and extends cylinder life. Transit FlexFrame U transportation system allows for versatile carrying. Includes 2 stainless steel keys. U Lock dimensions: 9 x 4 in.. Weight: 2.85 lb.