TurningMillingDrillingTechnicalInformationIndex Grade overview Solid carbide reamers Coated cemented carbide PVD A Grade Grade description KRG102 PVD coated P10–P20/K10–K20 carbide substrate for steel and cast iron. Uncoated cemented carbide B Grade Grade description YK10F Uncoated N10/K10 carbide substrate for cast iron and non ferrous materials. C D E C 129