These are good introduction bits to making tongue/groove joints. I made 6 drawer faces with them. But by the end of that project I felt like I wanted better bits. The groove cutter is ok, but as others have noted the tongue cutter is too narrow making for a loose joint and sometimes leaving paper thin wood remnants on top or bottom of a 3/4" piece. The tongue cutter also cuts about 1/32" too deep, meaning the tongue is just slightly longer than the groove is deep. I had to sand the end of every tongue down to make them fit tight. These issues made final glue up a challenge.