The Oxford HD Max Chain Lock comes with three keys and a key replacement service. With a 12mm chain with links made from hardened Ni-Cro-Mo steel, the long links reduce weight. It is zinc coated to prevent corrosion, with a cloth sleeve to protect paintwork. It is a case-hardened chain that resists bolt cutters. The padlock is a tough double-locking padlock with a 14mm hardened steel shackle. It has an anti-pick and anti-drill lock cylinder and can double as a disc lock.