The Faithfull Combination Padlock has a solid brass body with a 4-pin brass tumbler mechanism. It has a hardened and plated steel shackle encompassing a self locking action. The 4-digit combination system can be simply changed at any time to any one of 10,000 possible combinations. To change the number, simply turn the shackle 180 degrees and push into padlock body and rotate the dials to the desired new number Ref: UTTK11826