... of series of rock drilling tools, mining tools, DTH Drill tools. Construction tools and excavating coal pick cutter tools, we can also produce other ... , standard hex. Bit diameters include 20-42mm.2. Tapered drilling tools (Tapered Drill Steel)Including:Shank H22x 108mm, (6, 7, ... concave design fit for the atlas copco and ingersoll-rand model etc.5. Excavate coal cutter bitsInclude all kinds of round ...