We thought this was some pretty great versatility for just one machine. You can't have everything, though, so we highly recommend that if you are going to do much spiral coil binding, you find a standalone inserter to go along with the Uniquely positioned as the only pitch combo binding system on the market, the Akiles DuoMac is presented as a solution for businesses that want the ability to do a variety of binding styles all on one machine. Lots of features, lots of handles.When you endeavor to create a versatile machine like this, we suppose that there are inevitably things that are going to have to be left out. Comb binding is one of the cheapest, easiest, and most common binding systems on the market, and the DuoMac is able to produce books with comb bindings from three sixteenths cone winding machines to two inches in diameter. There is also a wire close included, so you can use this machine so you can bind books and documents in the slightly more durable and elegant spiral-o style as well. We suppose it may not be the most important aspect of choosing a binding system, but the DuoMac looks a little bit unwieldy, and has a bigger footprint than you might be expecting.3. This is a great thing for businesses that want to be able to have a more distinctive look for their documents on occasion.This feature really helps to ensure the durability and usability of the finished books.Three different looks, one machine. In other words, with just this one machine, it is possible to do three completely different binding styles. This is pretty unusual in the binding machine world, and can see how this would be a great advantage for really any size business that wants some flexibility in the types of docs that they want to be able to produce.Five to one pitch spiral coil offers a sophisticated professional look and the DuoMac is one of the only machines on the market that is able to pull it off. That being said, we would have liked to see the inclusion of an electric spiral coil inserter. With this machine you can punch hole patterns that can be used for plastic combs, and there is also a comb opener to complete the process.Some of the other great features that come with the DuoMac C51 are the multiple handle operation, that makes the machine safe, quick and easy to use, the continuous punching guides, and - very important for a machine with so many capabilities a depth of punch margin control. The chief feature of the DuoMac is that it is the only five to one pitch combination plastic comb and spiral coil binding system on the market. You should be aware that if you plan on doing some binding in the 5 to 1 pitch, you will need to prepare well ahead of time to get your supplies on hand as they can be a little bit hard to find, or may take a few days to be made once ordered.