The heads of our mining bits adopt tungsten carbide, which can drill powerfully into the rock to break the rock. Besides, while working, our mining bits can rotate freely in the holders to get the automatical sharpening effect. It is the only kind of mining bits that can get the automatical sharpening effect among the various kinds of mining bits. Not only can our mining bits be used in tunneling foundation work. but also can be used in road foundation work. Our mining bits and holders have always been exported to Australia, Brazil, Japan, South Korea, Turkey, Hong kong and other countries and regions, and have earned an excellent reputation for trustworthy quality, competitice price and most satisfied service. We also can make our mining bits according to Kennametal code, Betek code, Sandvik code and according to our customers samples and drawings.