Kryptonite U-Lukko Evolution STD 10.2cmx22.9cm is a robust high-security U-lock built to deter twist, pick, and drill attacks in demanding city parking. This U-lock is designed for riders who leave a bike in busy metro areas or lock up for longer stretches while commuting. Its protective vinyl coating helps reduce frame scuffs, while the included Flexframe-U bracket makes it easier to carry the lock in more than one mounting position. High-security U-lock with a hardened 14 mm Max-Performance Steel shackle for strong cut resistance Patent-pending hardened double deadbolt design to improve protection against twist attacks Updated smaller crossbar design for a more compact lock profile High-security disc-style cylinder built to resist picking and drilling Three stainless steel keys including a new key design and an LED replaceable key fob Flexframe-U bracket included for convenient multi-location transport on the bike Protective vinyl coating to help protect the bikes finish Key Safe Pr