The abus catena chain lock is a great value lightweight chain lock built with a 6mm hardened steel chain with a protective fabric cover not only keep your bike safe but protect it from any damage from the chain on the frame the realible locking cylinder with coded reversible keys ensures your bike is kept locked up safely in low theft risk areas the albus lock has a very practical use because only one end of the chain must be locked making it quick and easy to lock up your bike for the day