I bought this attachment cheaper to follow a template I made to cut a sink under a half inch Corian countertop. I cut out as much as I can with a hole saw and circular saw and use this bit to clean up the edges. I was able to play the whole opening (@21x16) in one shot and it was still strong. I have quality beats that I don't want to ruin, but this one really surprised me. Before I started this project I figured I would probably need a few bits. The warehouse management is also never frozen. Went like clockwork. I used 150 grit sandpaper to smooth out some imperfections, mostly due to the stencil itself. 150 then went to 600 grit. IT WAS CORIAN. Please check the material for functionality.