N/a manufacturer / supplier in China, offering Hole Opener 8 1/2 Inch Rotary Tricone Roller Tungsten Carbide Insert Roller Cone Bit for Well Drilling, Hole Opener TCI Roller Cone Tungsten Carbide Bit Rotary Insert Tricone Bit for Oil Gas Field, Drill Accessories16 Inch Tungsten Carbide Insert Rock Roller Tricone Rotary Bit for Well Drilling and so on.
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