DTH Bit, DTH Hammer, Button Bit manufacturer / supplier in China, offering CIR130 Drilling Bits 130mm Factory Made Mining Machinery Parts, CIR150 CIR170 CIR200 DTH Drill Bit 170mm 175mm 185mm 200mm 220mm 250mm Low Air Pressure Steel Bit Rock Well Drilling Used, Low Price Quarrying Well Drilling Tunneling Blasing Deep Hole Drilling Bit CIR110 3" 4" 5" 6" 8" Inch Mining DTH Bit and so on.