The Scan Combination Padlock has a solid brass body with a 4-pin brass tumbler mechanism. The 4-digit combination can be simply changed at any time with 10,000 different combination codes. Its hardened and plated steel shackle features a self locking action. To change number, turn the shackle 180 degrees and push into padlock body. Rotate the dials to the desired new number. Specifications: Overall Width: 38mm. Overall Height: 86mm. Overall Depth: 13mm. Shackle Width: 18.7mm. Shackle Height: 31.2mm. Shackle Diameter: 6.3mm.