This product works! I make cabinet drawers out of 1/4" plywood for the drawer bottoms. This 1/4" plywood is actually 5.2mm or 7/32. I tried a 1/4 inch cutter, it was too big, the bottom of the box rattled. I was going to do 2 passes with a 1/8" bit but that would take a long time. My wife found these pieces on Revain. One pass and the bottom fits perfectly. I highly recommend these beats.