Master Lock High Security D-locks deliver re-assuring security with features to protect your ride. This includes: A thick 13mm hardened steel shackle to resist cutting; A high security disc cylinder to prevent picking with an anti-drill plate for added protection; A dual locking mechanism to prevent pull/pry attacks. For ease of use the D-Lock has a shackle clearance of (h) 280mm x (w) 110mm. An anti-dust cover also protects the mechanism from the elements. A carrier bracket is included for easy storage.