PDC Drill Bit, Tricone Drill Bit, Tricone Hole Opener manufacturer / supplier in China, offering Drilling Bit 12 1/4" 6 Blades PDC Drill Bit of Diamond Tool, High- Performance 8-1/4" Diamond PDC Drill Bit of Drilling Tool, Rock Drill Bit 12 1/4 Inch Diamond PDC Drill Bits and so on.