If you have a GBC modular binding punch you can use these die sets to expand the capabilities of your machine. In fact all you need to do is buy a new die set and you will be able to punch a whole new hole pattern. Then, all you will need is the finisher (comb opener, wire closer or coil inserter). These dies can also serve as a replacement if your existing die is worn out or no longer punches cleanly. In either case all you need to do is buy the die and slide it in. What is holding you back?