It was surprisingly easy to use. I think that the price is a little expensive, but I think that it is okay for this price as it is solid and can be used again and again. I used to bind with a binding stitch so far, but it is easier than that, and it can be easily tightened tightly.
I do not take the place easily in inventory, I think that it is very good. Since it is a nonstandard object, there is no cover like a file, so it is troublesome to cut cardboard. Other than that, the thickness is enough and it is good.