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8 1/2'' PDC Drag Bit 3 Wings 4 Wings Rock Drilling Bit for Water Well, Find Details and Price about Oil Well Drilling Drag Bit PDC Drilling Drag Bit from 8 1/2'' PDC Drag Bit 3 Wings 4 Wings Rock Drilling Bit for Water Well - Hejian Longyue Drill Bit Manufacture Co., Ltd.