It is a random code included in the package once you purchase your lock for the first time. To open a 4 digit master lock, you need to have your current combination number. However, having all the items will help you finish the steps faster and easier. You can do this tutorial without the optional tools. You can find them in your house or borrow them from your neighbor. The items you need in this tutorial are easy to find.
6 Steps to Open a 4-Number Combination Lock.