These modular die sets are designed for use with the Akiles Flexipunch series binding punches. Simply remove the die that you currently have in your machine and replace it with the new punching pattern that you are looking for. There are currently four different die sets available for the Flexipunch including Comb (19 hole), Coil (4:1), 2:1 Wire and 3:1 Wire. The same dies are used on both the electric and manual versions and they are extremely easy to change and to use. They even have fully disengageable punching pins on the front to make handling custom length documents extremely simple.