Trying to use the diamond plates, or stones if you have those, without a way to hold them in place is a pain. I quickly decided to make a holder for my DMT Diamond plates. Several of the ones I saw online used a chisel to dig a slot into the plywood base for the plate to rest in. I thought it would be far easier to just glue on some thin plywood strips, as my chisel skills aren’t the greatest. I used 3/4″ plywood as a base, and thin strips of 1/4″ baltic birch plywood around the stones. Dimensions weren’t critical, I have the 8″ plates, it depends on what stones or plates you have as to how big you will make yours. Also, yours may only hold three plates, it just depends on how many plates or stones you will be wanting to hold.