Kryptonite U-LockBike Lock By Excellence This Kryptonite D Lock works to resist bolt cutters and leverage attackers, and with a patent pending hardened double deadbolt design, this gives your bike additional protection against twist attacks. Check out more locks here. Specifications And Features 14mm Hardened Max Performance Steel Shackle 3 Stainless Steel Keys Including New Key Design & One LED Replaceable Key Patent pending, Hardened Double Deadbolt Design Gives