OXFORD MAGNUM U-LOCK (170X285MM) WITH BRACKETThe Magnum is an ultra strong U lock. It boasts high security, an independently approved 16mm shackle lock with hardened steel construction, and has undergone rigorous testing, achieving Sold Secure GOLD, ART 4*, SBSC, and FG certification. The Magnum has a key replacement service. When you buy your Magnum, simply note down the number which comes attached to the keys on a metal tag. Keep this in a safe place, then in the event that you are unfortunate