Core Drilling Rig, Diamond Core Bit, PDC Bit manufacturer / supplier in China, offering Factory 4 6 Inch 122mm PDC Core Drill Bit Water Well Drill Bit Rock Borehole Bit for Well Drilling, Non-Coring Bit Aq Bq Nq Hq Pq 4 Wings Four Blades PDC Drill Bits 140mm PDC Cutter Diamond Oil Drill Bit for Oil Mining Well Drilling, Idac TCI Tricone Drill Bit for Water Well Drilling and Oil Mining Three-Cone Bit Diamond Core Drill Bit and so on.