in tumbler cylinder with anti-pick mushroom pins which resists picking, a hardened steel shackle which resists hacksaw attacks and double bolted 30mm and above for increased shackle strength. This ABUS 55/50 Brass Padlock is supplied carded and has the following specification ABUS Security Level: 5. Shackle Width: 25mm. Shackle Height: 24mm. Shackle Diameter: 7mm. Overall Width: 48mm. Overall Height: 68mm. Overall Depth: 14mm.