This lock is made for police, fire, hospital, and airport security use, but is ideal for locking up your jacket, helmet, and tank or seat bags. Light, fast and easy to use. One end terminates in a no-scratch, vinyl booted, aluminum sleeve that protects a recessed Ace cylinder lock. The other end of the flexible, nylon covered, ‘7 over 7’ stainless steel aircraft cable, releases. The 4mm cable is hard to cut and small enough to thread through tight places. The lock is hard to break. Cable/Chain Comparison (w/ and w/out locks)