1.Retrac button bits 2.ore mining,many types 3.good price and ... ,7,11,12 degree taper) taper rods in most lengths.button bits, cross type bits and chisel bits with(6,7 ... and controlled straightness.4. Down the hole hammers and DTH button bits (Down The Hole Drilling)Offer ir hammers,DHD3.5 ... : 19.4mm, 25mm,30mm,33mm,38mm,etc.8. Blast furnace tap hole drill tools.(Rod, Cross type bits, button bits and X ...