Kryptonite security levels: 1 (Low) - 10 (High) Bike thieves can Fahgettaboutit, engineered to keep your bike safe even in the toughest neighborhoods Bike thieves can Fahgettaboutit, engineered to keep your bike safe even in the toughest neighborhoods Six sided 14mm chain made of 3+ manganese Includes maximum security New York Disc Lock with 15mm MAX-Performance steel shackle Hardened double deadbolt locking for extensive holding power High security disc-style cylinder with reinforced anti-drill, anti-pull protection system 3 keys (1 w/light)