To suit: Indexa Seiki multi-Pro Spot Drills & Chamfer Mills. | | Insert Grade Description: | (ISO P10/M10/K10) Tin Coated Multi-purpose grade for general use, can cut the majority of ferrous and non-ferrous materials used in industry. | (ISO P20) Uncoated Grade for steel and stainless steel application. | (ISO K10) Uncoated Grade for cast irons, aluminiums, and non-ferrous materials.