Well first of all I'm not a professional carpenter, I just do this as a hobby. I will say these things are great and I have had no problems with them and to be honest with all the Yonico bits I have purchased through Precision Bits. So I used them on different types of wood, which is a bit unusual to be honest; but I'm working on a special project. Let me just say that I've used it on Blood-wood and Purple-heart, both very hard woods. So the Beats survived, yes they did. I had minimal burningβ¦