Kryptonite KryptoLok Series-2 912 Integrated Chain Bicycle Lock Bike Lock 9mm four-sided chain links made from3T MANGANESE STEEL Patent-pendingEND LINK DESIGNsecures chain to hardened deadbolt eliminating critical vulnerability HardenedDEADBOTL DESIGNprovides additional protection HIGH SECURITY DISC-STYLE CYLINDERis pick and drill resistant Patent pending integrated lock head with"TALON" DEADBOLT Includes2 NEW ERGONIC "I" KEYS DurableWEATHER-RESISTANTnylon sleeve prevents scratches Key Safe Program Product dimensions: 47.25 (120cm) chain length Product weight: 6.7 lbs (3.04 kgs)