Router Bit Set-Up Jig for 40431 Shaker Stile and Rail Router Bits

I have used this a couple of times to setup my router bits and I have discovered that the best way to setup your router bits for tongue and grove cuts is to setup the router bit height by height, use a ruler and mark off center, cut the tongue then use the piece you cut to mark off the grove. This setup jig doesn't work with every router bit, so save money and time, measure and setup.