... endurance 4.better chip removal core drill set1. Universal shank can be quick clamped, it is convenient and is applicable to hole cutting ... high speed steel., e.g. M2, M2AL, M35, M42 etc. And can be used on various materials, like steel plate, Copper ... , aluminium, cast iron, stainless steel and plastic. 4. Special multi-cut geometry with ply-cutting ...