PDC Drill Bits, Machine Spare Part, Tricone Drill Bit manufacturer / supplier in China, offering 94mm Double-Pipe Thickened with Point Hot Press Drill Bit for Backfilling Formation, 101mm Double Tube Hot-Pressing Coring Drill Bit for Core-Pulling Concrete Pile, 165mm DTH Hammer Button Drill Bit for Hard Rock Water Well Drilling and so on.