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8 1/2 Inch IADC127 Milled/Steel Tooth Bit for Water Well Drilling, Find Details and Price about 8 1/2 Milled Tooth Bit 6 1/2 Milled Tooth Bit from 8 1/2 Inch IADC127 Milled/Steel Tooth Bit for Water Well Drilling - Hejian Longyue Drill Bit Manufacture Co., Ltd.