... 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 ... diameters include 20-42mm.2. Tapered drilling tools (Tapered Drill Steel)Including:Drill rods with Shank H22x108mm,(6,7,11,12 ... 25mm,30mm,33mm,38mm,etc.8. Blast furnace tap hole drill tools.(Rod, Cross type bits, button bits and X type ...