China Manufacturer Steel Body 3 Wings PDC Non Coring Drill Bit With 3 1/2 Inch Reg Thread 60mm,75mm,95mm,122mm Core Drill Bit For Well Drilling Three Wings/tricone PDC Drill Bits for coal mine 1...View More
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Steel Body 3 Wings Non Coring Drill Pdc Bit With 3 1/2 Inch Reg Thread