TurningMillingDrillingTechnicalInformationIndex Grade overview Solid carbide drills Coated cemented carbide PVD A Grade Grade description KDG303 PVD coated P10–P20/M10–M20/K10–K20 carbide grade for steel, stainless steel and cast iron. Good wear resistance andtoughness for a wide application field. Uncoated cemented carbide B Grade Grade description YK20F Uncoated K20 carbide substrate for steel, cast iron and non ferrous materials. YK30F Uncoated K30 carbide substrate for steel, stainless steel, cast iron and non ferrous materials. C D E C 27