KryptoLok 2 StandardThe KryptoLok Standard U Lock is the easy choice when you need a U Lock with moderate level security. With a double deadbolt design you can rest assured that this lock can withstand cut and twist attacks from pesky bike thieves. 12. 7mm hardened performance steel shackle Hardened double deadbolt design gives additional protection against twist and cut attacks High security disc style cylinder is pick and drill resistant Dust cover Includes FlexFrame U