... base 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, ... hammers and DTH bits (Down The Hole Drilling)Offer IR hammer, DHD3.5, DHD340a, DHD360, DHD380, and low pressure hammers ...