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8 1/2'' Steel Tooth/Milled Tooth Tricone Bits for Water Well Drilling, Find Details and Price about 8 1/2 Milled Tooth Bit Milled Tooth Bit from 8 1/2'' Steel Tooth/Milled Tooth Tricone Bits for Water Well Drilling - Hejian Longyue Drill Bit Manufacture Co., Ltd.