Drilling Rig, Drill Bits, DTH Drill Rig manufacturer / supplier in China, offering Oilfield Grade 6 1/2 Inch PDC Drill Bit 5 Blade for Mining and Exploration, High Performance 6 1/2" PDC Bit 5 Blades Steel Body or Matrix Body for Construction Drilling, 5 Blade PDC Drill Bit 6 1/2 Inch for Water Well and Hydropower Drilling and so on.