... coupling, shank adapter, mining tools, button bits, cross type bits, drill rod. We are a professional manufacture of rock drilling tools, mining ... tools and excavating coal pick cutter tools.1. Integral drill steels (Integral Drill Rods)Shank H22x108mm, H19x108mm, standard hex, Bit diameters ... ,30mm,33mm,38mm,etc.8. Blast furnace tap hole drill tools.(Rod, Cross type bits, button bits and X type bits ...