9mm temper hardened steel for secure U-Lock protection in a versatile size. Double bolting shackle provides anti-twist protection. Premium double-layered cylinder core provides added protection against picking. Soft-touch coating for a smooth look and feel that protects bike from scratching. Simple mount installs in seconds for simple, versatile on-bike storage. Industry leading corrosion resistance. Includes U-Lock, bike mount, and 2 keys (replacement keys available). Security rating 8.