This high quality die set is designed for use with the Akiles FlexiPunch-E electric binding punch. Akiles produces four different die sets for the FlexiPunch-E binding systems. Choose a die for plastic comb binding, 3:1 pitch wire binding, 2:1 pitch wire binding or 4:1 pitch spiral coil binding. When you buy a new FlexiPunch-E binding machine it will come with one die of your choice. However, you can quickly expand the capabilities of your machine by simply purchasing a new die set. Just remember that you will also need to buy a Wire Closer to finish your wire bound documents.