... and high quality 5. Export to many countries conical pick size analysisWe are a professional manufacture of rock drilling tools ... mining tools, DTH Drilling tools. construction tools and excavating coal pick cutter tools.1. Integral drill steels (Integral Drill Rods)Shank ... manufactured with a middle stop to prevent walking along the thread. Include couplings sleeve(threaded R22,R25,R28,R32,R38,T38 ...