This tool is quite useful for tough material like leather, it can be adjusted to poke different size holes from 1/4 inch to 1 inch and all the sizes in between and comes with 2 blades on the tool, and also comes with 2 extra blades for a total of 4 blades. Just set it where you want to put a stud, hit it with a hammer and you have two holes that you can slip the stud through, It's that simple.