A particularly deep-framed U-lock which enables versatile attachment to various attachment points. U-Lock is the safest choice to protect your bike from thieves - it is the most burglar-proof choice. You can transport the U-lock with the holder that comes with the lock or if you choose you can carry the lock with you in a backpack or bike bag.  The hardened steel arc of the lock is difficult to break or split, and its lock seat is difficult to break. With a U-lock, you should lock the bike to something solid if possible. You should put the lock around the frame and the rear wheel, if any ways possible. 14mm hardened max-performance steel shackle. 3 stainless steel keysincluding new key design and one led replaceable key fob. Patent-pending hardened double deadbolt design gives additional protection against twist attacks. New smaller crossbar design. Higher security disc-style cylinder is pick and drill resistant. Includes flexframe-u bracket providing convenient multi-location u-loc