13mm 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 your bike from scratches;The 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 10;