Kryptolok Standard w/ 4' Flex CableDescription Combining heavy duty security and practical flexibility, the Kryptonite KryptoLok Standard ULock with 4 KryptoFlex Cable (Model 001966) is ideal for daily urban cycling. The 12. 7 mm hardened performance steel U shackle, paired with a patent pending double deadbolt design, thwarts twist and leverage attacks. A highsecurity disc style cylinder resists picking and drilling, while a sliding dust cover protects the lock mechanism from dirt and