Top quality, the best, suits me. Note, however, that these bits may not have the extra bearings you need to do your job. Whiteside also makes tongue and groove bits. In some cases, depending on many factors, you may need cutters with additional bearings. This will prevent the bit from retracting into the wood and then cutting deeper than intended. That can happen with these beats. When this happens, it usually happens at the very end of the board.