Tricone Bit, PDC Bit, Hole Opener manufacturer / supplier in China, offering 6 3/4′′ PDC Steel Drill Bit S416 Water Well Drilling Bit, 17 1/2′′ Steel Body PDC Bit Oilfield Drill Bit Water Well Bit, 15 1/2′′ Steel Body S616 PDC Drill Bit and so on.
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