I wanted to use oak for a job that was 1'' thick .Boy was that slow cutting .After cutting 6'' I decided to switch to something else or pull my hair out.I tried lots of blades but this may have been the hardest wood I ever cut. Might have been ash not sure ,but I threw it all away what I had so I don't make that mistake again . Oh yeah now I remember it was wood from a chair ,solid wood no cushion.I saved a lot of chair seats too!