N/a manufacturer / supplier in China, offering API 9 1/2inch Roller Cone TCI Tricone Drill Bit for Water Well, API Tricone Rotary Drill Bit TCI Tungsten Carbide Insert Bit Roller Cone Bit for Oil Well Hard Rock Drilling, API Standard 7 Blades PDC Bit 6 1/2" 22" PDC Drill Bit Rock Drilling Bits for Oil Gas Drilling and so on.
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