TurningMillingDrillingTechnicalInformationIndex Grade overview Parting & grooving Parting & grooving A Grade ISO Micro structure Grade description YBG302 P15 - P30M25 - M40 PVD coated P15–P30/M25–M40 carbide substrate for medium roughing application ofstainless steel and steel (milling). Good wear resistance and toughness. YD101 K05 - K20N05 - N20 Uncoated K05–K20/N05–N20 carbide substrate for fine to medium application inaluminum and other material.B YD201 K10 - K30N10 - N30 Uncoated K10–K30/N10–N30 carbide substrate for medium application in aluminum andother material. C D E A 347