I got them for a 3/4 layer project. I used scrap wood and missed a screw. Ooh. But mine is bad. Even if a decent bit of carbide is ripped out of the drill, it still cuts well. [only one of the two cut edges damaged] Good product but all plywood sheets are not dimensionally accurate. The layer I used was less than 3/4 but more than 23/32. You may still need to realign the fence and do another pass.