So are mine - DMT Dia-Sharp extra-coarse (220) and fine (1200). I have the DMT lapping plate as well. I’m gradually replacing my water stones as they wear down with these. I’m very pleased. I still have Norton 4000 & 8000 water stones that I finish with. I doubt I’ll need to replace them, but if I do it will be with diamonds. 10 strokes on horse butt leather with green compound for a final hone.