Kryptonite Keeper 755 Mini Integrated Bicycle Lock Chain Bike Lock The mini version (55cm) of the popular Keeper 785 LIGHTWEIGHTfor easy transport - only 2 lbs 7mm four-sided chain links made from3T MANGANESE STEEL NewEND LINK DESIGNsecures chain with hardened deadbolt HardenedDEADBOLT DESIGNprovides extra holding power HIGH SECURITY DISC-STYLE CYLINDERis pick and drill resistant Includes2 NEW ERGONOMIC "I" KEYS DurableWEATHER-RESISTANTnylon sleeve prevents scratches Key Safe Program Product dimensions: 21.5 (55cm) chain length