PDC Drill Bit, Tricone Drill Bit, Tricone Hole Opener manufacturer / supplier in China, offering Drilling Equipment Tool 6-1/2" PDC Drill Bit of Rock Drilling Tool, Diamond Drill Bit of Water Well 5-7/8" PDC Drill Bit, Rock Drilling 15-1/2" Tricone Bit IADC 537 of Water Mining Bit and so on.