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Parameters of DTH bit (Down the hole drilling hammer) type drill diameter mm(inch) weight (kg) TH79(3.5inch) 90mm-100mm(3 1/2-3 7 /8) 4-4.5 DHD3.5 90mm-105mm(3 1/2-4 1/8) 4.5-5.5 BR33 90mm-100mm(3 1...