... About usWe are a professional productions base of series of rock drilling tools, mining tools, DTH Drill tools. Construction tools and ... controlled straightness.4. DTH hammers and DTH bits (Down The Hole Drilling)Offer IR hammer, DHD3.5, DHD340a, DHD360, DHD380, and ... machine.Shank diameter=19.4mm, 25mm, 30mm, 33mm, 38mm, etc.8. Blast furnace tap hole drill tools. (Rod, Cross bits, button ...