Product details:

Quite possible the strongest Ulock for bicycles in the World This extreme bicycle U-lock handles the urban areas, college campuses and other high theft danger areas. 18 mm through-hardened Kryptonium Steel shackle resists bolt cutters and leverage attacks. High security disc style cylinder. Hardened steel sleeve over crossbar for double security. Double deadbolt locking mechanism for extensive holding power. Center keyway defends against leverage attacks. Small enough to fit into a cargo pants pocket. Sliding dustcover protects cylinder. 3 keys - one lighted for nighttime use. Protective vinyl coating. For increased security, pair with a KryptoFlex cable to lock your quick-release wheels and accessories.