PDC Drill Bit, Tricone Drill Bit, Tricone Hole Opener manufacturer / supplier in China, offering Rock Diamond Drilling 6 1/2 Inch PDC Drill Bit IADC M223, 12 1/4 "PDC Drill Bit of Rock Diamond Drilling Tool, Rock Diamond Bit 9-1/2 " PDC Drill Bit of Drilling Tool and so on.