These are very good quality chisels. I used them with my Powermatic 719T slotter to make wenge grooves. In the past I've done this with a router and chisel. Wenge is a fairly hard wood (and brittle). I was a bit skeptical about how well they would work based on my previous experience with a router and chisel. However, it is very easy to make grooves with these chisels. No smoke, nothing. I could easily make grooves on wenge.