This bit was bought to cut the tongue and groove on the rounded part of a table saw insert with no gap and it worked great. My problem was removing the hex screws on both the guide bearing stack and the bit. They were both tightly adjusted, and the steel flipped where the key engages the screw. Fortunately the screw was not damaged. I have a set of good quality Allen keys and was able to remove the screws with no problem. All in all the price was reasonable for my needs but I'm not sure I would want to use this bit for more demanding work.