... button bits (Down The Hole Drilling)Offer ir hammers,DHD3.5,DHD340a,DHD360,DHD380,and low pressure hammers CIR65a, CIR90, CIR110 ... fit for the atlas copco and ingersoll-rand model etc.5. Excavate coal cutter bitsInclude all kinds of round cutter bit ... ,etc.8. Blast furnace tap hole drill tools.(Rod, Cross type bits, button bits and X type bits etc) drill pipe