These 10 pieces are almost perfect for every cutting job you might want when using a rotary Dremel tool on plastic or wood. My only regret, not a complaint, is that the set did not include a pure side-cutting cylinder shape. Another set by this same company does include such a shape. That said, these appear to be long-lasting and quite versatile. I have yet to explore how all the shapes can be used, but the three I tested worked quite well.