... and excavating coal pick cutter tools.1.Integral drill steels(Integral Drill Rods)Shank H22x108mm, H19x108mm,standard hex, Bit diameters include ... 20-42mm.2.Tapered drilling tools(Tapered Drill Steel)Including:Drill rods with Shank H22x108mm,(6,7,11,12 degree taper ... design :Flat face, drop centre, Normal and retrac body.tungsten carbide(Buttons):Spherical, ballistic and Conical.(Threaded R32, T38, T45, ...