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9 7-8" 251mm Steel Tooth Roller Bit/Milled Tooth Bit for Water Well Drilling, Find Details and Price about 8 1/2 Milled Tooth Bit 6 1/2 Milled Tooth Bit from 9 7-8" 251mm Steel Tooth Roller Bit/Milled Tooth Bit for Water Well Drilling - Hejian Longyue Drill Bit Manufacture Co., Ltd.