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Steel Milled Tooth Bit 7 1/2 Tricone Bit/ Rock Drill Bit for Water/Oil/Gas Well Drilling, Find Details and Price about 8 1/2 Milled Tooth Bit 6 1/2 Milled Tooth Bit from Steel Milled Tooth Bit 7 1/2 Tricone Bit/ Rock Drill Bit for Water/Oil/Gas Well Drilling - Hejian Longyue Drill Bit Manufacture Co., Ltd.