DMT W250FCNB Fine/Coarse Diamond Stone The DMT W250FCNB Fine/Coarse Diamond Stone 10 inch DuoSharp® is the ultimate diamond benchstone. All of the advantages of the 8″ model, but with 87% more of DMT®’s trademark interrupted polka-dot diamond sharpening surface. Each of these double-sided benchstones offers over 4 carats of micronized, monocrystalline diamond. Size: 10″ x 4″x 0.375″ (250mm x 100mm x 10mm) DMT Standard Diamond Grits SILVER (XX) Diamond – Extra-Extra Coarse Aggressive edge repair when bringing a tool back from what looks like the end of life –a safe alternative to powered grinding. (120 mesh, 120 micron) BLACK (X) Diamond – Extra Coarse Use to rapidly repair damaged or real rough edge. (220 mesh, 60 mircron) BLUE (C) Diamond – Coarse Transforms a dull edge to cutting condition. (325 mesh, 45 micron) RED (F) Diamond – Fine Use to put a great edge on slightly dull knives or tools. (600 mesh, 25 micron) GREEN (E) Diamond – Extra Fine Gives everything a polished and razor sharp edge. (1200 mesh, 9 micron) CERAMIC (CER) Available only in DMT® Ceramic Steel (CS2) and corresponds to 2200 mesh, 7 micron. TAN (EE) Diamond – Extra-Extra Fine For the edge enthusiast who wants the ultimate edge. (8000 mesh, 3 micron)