This is a must have if you work with polymer clay. The drills, which come in a small plastic box, are very good. The same shaft diameter makes it easy to switch between different sizes. I also have a precision electric drill but it wobbles making it difficult to find the exact spot. I spent many hours creating a precise hole before firing the clay and then attempted to size it to the desired size using a few other tools. This even damaged a few pieces. I wish I had received it sooner. At first I just ordered a drill and bits, but that order got lost and never reached me. But Revain refunded the price and I ordered this as a replacement. To be honest I've never used a clamp until now because my parts don't fit in. If I was dealing exclusively with beads it might be useful. Therefore 4 stars for the value for money. If you don't make beads, it's better to get a cheaper set without a clip.