25pcs 1616/1908/1913/1916 Composite PDC bit,Diamond drill bit for oil drilling,geological exploration,coal mining,Well Drilling.

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1608 Well Drilling,Diamond drill bit,Composite PDC bit for oil drilling,geological exploration,coal mining

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3 Wings Step Drill Bit Well Drilling PDC Drag Bit For Mining Drilling Bit Geological Exploration Coal Mining

3 Wings Step Drill Bit Well Drilling PDC Drag Bit For Mining Drilling Bit Geological Exploration Coal Mining

3 Wings Step Drill Bit Well Drilling PDC Drag Bit For Mining Drilling Bit Geological Exploration Coal Mining

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