N/a manufacturer / supplier in China, offering API 7-1 Factory 8 1/2" Xme Tri-Cone Drill Bit for Water, Oil and Gas Well Drill, API Xj350 Xj550 Xj650 Xj750 Flushby Unit Workover Rig Oil Well Drilling Rig, Washover Cutter Hydraulic Internal Cutter Type Wd-S and so on.