N/a manufacturer / supplier in China, offering 3-7/8" IADC537 Tricone Roller TCI Drilling for Oil Petroleum Water Mining Rock Well Drill Tools Diamond Drill Bits Oilfield Water Well Bit, Top Quality Diamond PDC 8 1/2 Inch Rock Drill Bit of API Spec, Workover Tools Model Gqc High-Efficient Fishing Magnet and so on.
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