I bought this kit to finish the inside wall of a barn using half inch planks of various woods. The bits cut well and I didn't have to adjust the stop between bits. The beveled edge made the result attractive. But the tongue barely entered the groove and the fit was very tight. My solution to the first problem was to use a small hand plane a couple of passes on each side to narrow the tongue, but with a better bait. would make this cone for me. A tight fit could be facilitated by simply making a second pass through the router, and of course the fit could be further loosened by slightly raising or lowering any bit for the second pass.