The Scan Brass Combination Padlock comes with a solid brass body and 4-pin brass tumbler mechanism. The 4-digit combination can be simply changed at any time with one of 10,000 different combination codes. To change number, turn the shackle 180 degrees and push into padlock body. Rotate the dials to the desired new number. It also features a hardened and plated steel shackle which is locked in place by rotating the dials.