The Oxford Monster disc lock boast a 11mm hardened Ni-Cr-Mo alloy steel shackle with double locking mechanism and 2 hardened steel bolts. The 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. The Monster disc lock comes with a carry pouch, minder cable and free bottle of lock lube. The lock has 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.