... 3.virgin raw material 4.advanced equipment 5.experienced techici cemented carbide /tungsten carbide We are the one of leading manufacturers in zhuzhou ... and boards, saw tips, round rods, rock drilling bits and buttons, milling tools, geological exploration drill tools and so on. Our ... t any harm such as pore canbe shipped out. High density,high wear&impact resistance,which lead them a long lifetime.If ...