The Kryptonite KryptoLok Standard U-lock is an excellent choice for cyclists looking for a high-quality lock to protect their bike from theft. The lock has a 13mm hardened steel shackle that resists cutting and leverage destruction, making it a very secure option. The lock also features a reinforced hard cross bar design that provides extra protection and a high protection, disc-style cylinder. Anti-rattle bumpers reduce noise during transport and the rotating dust cover protects the cylinder against dirt and dust. The Kryptonite KryptoLok Standard Bracket Lock comes with a patented EZ Mount transport system, which allows for various carrying options. The lock is supplied with 2 stainless steel keys and has a protective vinyl coating. knowing that it is well protected against theft. Read less"