The Bell Catalyst 550 U-lock with bonus cable features a 9.25-inch hardened-steel shackle and 4ft-x-12mm HD steel cable for your highest-security needs while on your bike or scooter. Our patented Anti-Theft shackle steadily resists twisting so that it can’t be pivoted out of the way if one side of the lock is cut. Includes a mounting bracket for on-bike storage, one standard key, and one lighted key which makes travel and locking or unlocking bikes at night a breeze. Bell also offers a free standard key replacement program.