Kryptonite kryptolok Series 2 915 Integrated Chain Locks have a 9.5mm four-sided chain links made from high performing 3t manganese steel. Hardened deadbolt design provides additional protection against leverage. Integrated KryptoLok series 2 lock head with talon deadbolt. New design secures chain directly to hardened deadbolt. Offers no ''weak'' link in the chain. Extensive holding power of the link itself holds against attacks. Weather-resistant nylon sleeve prevents scratches to painted finishes. High security disc style cylinder. Technology provides increased pick and drill security. Includes 2 stainless steel keys. Anti-Theft Protection Offer