The Oxford Monster Ultra Strong Disc Lock was designed with widened access to the disc which enables a much easier fitment. It can also be used with a chain as a padlock.Can be used as a padlock or disc lock11mm hardened Ni-Cr-Mo shackleDouble locking mechanism with 2 hardened steel boltsSliding key dust coverThree keys and replacement key serviceSold Secure Motorcycle GoldThe Oxford Monster Ultra Strong Disc Lock has a 11mm hardened Ni-Cr-Mo shackle and a double locking mechanism with 2 hardened steel bolts. There is a sliding key dust cover to provide protection from corrosion and rust. The lock comes with three keys but there is also a key replacement service so that if you are unfortunate enough to lose all your keys a new one can be made up. Just remember to take note of your key number and keep this in a safe place.The lock has been rigorously tested both independently and by Oxford and is Sold Secure Motorcycle Gold approved.