... construction tools and excavating coal pick cutter tools.1.Integral drill steels(Integral Drill Rods)Shank H22x108mm, H19x108mm,standard hex, Bit ... (threaded R22,R25,R28,R32,R38,T38,T45,T51)Shank adapters-carburized and manufactured with tight tolerances and controlled ... rand model etc.5.Excavate coal cutter bitsInclude all kinds of round cutter bit and flat cutter bits for excavate coal machine ...