... diameter (emulsified liquid), SKD11(HRC62°),rotation speed 1600r/min, f≤199mm/min, depth of drilled hole≤2.5*φD(mill ... wear-resistance. Generally applied in worse or general equipment to machine materials of lower hardness (HRC≤25°), discontinuous cutting and worse ... has 1-2 times lifetime and excellent wear resistancecenter drill , flat drill , masonry drill , drill pin , twist drill , high hardness ...