I bought a machine to help with installing comb bindings on books. I use it all the time with my piano music and my quilting books. I had one large book of Mozart sonatas completed with a nice comb binding before I bought my own machine .Staples took three days to do it and it was annoying. I figured I could do it myself and save time and money. I use it often and on any book or pattern I like to have lay flat.