... professional productions base of series of rock drilling tools, mining tools, DTH Drill tools. Construction tools and excavating ... .tungsten carbide(Buttons):Spherical, ballistic and Conical.(Threaded R32, T38, T45,T51, bit diameter: 45mm-127mm);Couplings sleeves-manufactured with ... round cutter bit and flat cutter bits for excavate coal machine as the replacements of kennametal. Such as U76, U82, ...