Kryptonite New-U Evolution Series 4 Standard Heavy Duty Bicycle U Lock Bike Lock (4-Inch X 9-Inch), Black

14mm hardened max-performance steel shackle

3 stainless steel keys — including 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