... Rods)Shank H22x108mm, H19x108mm, standard hex. Bit diameters include 20-42mm.2. Tapered drilling tools (Tapered Drill ... a middle stop to prevent walking along the thread. Include couplings sleeve (threaded R22, R25, R28, R32, ... model etc.5. Excavate coal cutter bitsInclude all kinds of round cutter bit and flat cutter ... bolting bit and coal bolting rod.6. All kinds of casing bits for shield machine and ...