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8 1/2" IADC637 Rotary Drilling Single Roller Cone Bit, Tricone Cutter Bit for Core Barrel

8 1/2" IADC637 Rotary Drilling Single Roller Cone Bit, Tricone Cutter Bit for Core Barrel
single roller cone bit  Bit SizeBit Typeinmm31/288.9HR537HR637        45/8 117.5HR117HR115HR537HR637HR737     43/4120...

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