... high speed steel 3.better endurance 4.better chip removal core drill set1. Universal shank can be quick clamped, it is convenient ... ., e.g. M2, M2AL, M35, M42 etc. And can be used on various materials, like steel plate, Copper, aluminium, cast iron ... TiAIN coating are available upon request6. The product is mainly used to process the hole of steel component, such as steel ...