I bought these to make mission style doors for some closets. You have done a great job. These bits come with spacers which allow you to cut tongues and grooves exactly to the thickness of the plywood which I had was 5.9mm. Most plywood sold as 1/4" is smaller than 1/4" these days, and these bits will allow you to make doors that won't rattle no matter how the groove is glued. These bits must be used with the routing table.