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12 1/4'' ADC127 Steel Milled Tooth Bit TCI Tricone Drilling Rock Bit, Find Details and Price about 8 1/2 Milled Tooth Bit Milled Tooth Bit from 12 1/4'' ADC127 Steel Milled Tooth Bit TCI Tricone Drilling Rock Bit - Hejian Longyue Drill Bit Manufacture Co., Ltd.