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12 3/4'' IADC 115 Milled Tooth Tri-Cone Roller Cone Drill Bit, Find Details and Price about Tricone Bit Steel Tooth Tricone Bit from 12 3/4'' IADC 115 Milled Tooth Tri-Cone Roller Cone Drill Bit - Hejian Hengji Bit Manufacture Co., Ltd.