9mm temper hardened steel for secure U-Lock protection in a compact package;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 Mini U-Lock, bike mount, and 2 keys (replacement keys available);Security rating 8;