The ABUS 55 Series Brass Padlocks have inner components made from non-corrosive materials. They feature a pin tumbler cylinder with anti-pick mushroom pins, a hardened steel shackle that resists hacksaw attacks, and double bolted construction for increased shackle strength. This specific ABUS 55/40HB63 Brass Padlock has a security level of 4, is keyed alike with key reference 5401, and has a 63mm long shackle.