Bought for making cabinet doors. Unfortunately I wasn't able to use these bits before the return window opened or they would have come right back. The first two knives were just not sharp (end and side cutters). Due to an imbalance, the vibration was so strong that I was too afraid to use a third larger cutter. I've lost quite a bit of lumber to chatter and inaccurate cuts caused by the drill bit pacing due to vibration. BTW the cutter is not as described in the title, the rail and floor cutters are not in the traditional "Ogee" double curve style.