Tricone Bit, TCI, Drilling Bit manufacturer / supplier in China, offering Rock Drillingbit/Rock Tools/TCI Bit/Tricone Bit/12 1/4" IADC645 / Drill Bit, Rock Drilling Tools 12 1/4" IADC Code 825 Mining Machinery Water Well Drilling Bit Rock Drilling Tools Drill Bit, 12 1/4" TCI Bit Rock Drilling Tools IADC Code 642 Mining Machinery Water Ewll Drilling Tools API and so on.