Drill Pipe, Drill Rod, Diamond Bit manufacturer / supplier in China, offering 57.2-117.5mm Head Assembly 1.81-4.06 Inch Nq Bq Hq Pq, Drill Pipe for Geological Exploration Core Drilling Rod, PDC Non Coring Bit for Exploration Drilling Nq Hq Pq Nq3 Hq3 Pq3 and so on.
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