The D8C is 325 mesh which translates into 325 grit, just different words. Same meaning as far as I,m concerned.

That is a great plate to get. It will rework a damaged edge and lap your stones,, and as it gets worn a very good stone to start your slurry or clean your Hones.

I agree with Stephan, the Atoma 400 is my go to for flattening new stones now, it does not load up as quick and is a fast cutter, but I use my DMT. For everything, kitchen knives, pocket knives, and slurry. Tc