The ABUS 55 Series Brass Padlocks have inner components made from non-corrosive materials. Pin tumbler cylinder with anti-pick mushroom pins which resists picking, a hardened steel shackle which resists hacksaw attacks and is double bolted 30mm and above for increased shackle strength. This ABUS 55/40HB63 Brass Padlock has the following specification: ABUS Security Level: 4. Keyed Alike Key Reference: 5401. Shackle Width: 21mm. Shackle Height: 63mm. Shackle Diameter: 6.5mm. Overall Width: 38mm. Overall Height: 102mm. Overall Depth: 13mm.