Body Material: Zinc Alloy Shackle Material: Hardened Steel Type: Combination Disc lock How to set your own code? 1.Set the code to default(0-0-0-0) and open the padlock 2.Use a clip or screw driver to turn the screw from A to B anticlockwise 3.Set your own combination code 4.Turn the screw from B to A, then the new combination is set successfully Note: -Before purchasing the padlock, please make sure that the shackle size of the padlock meets Your requirement.