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7 1/2'' 190mm IADC 537 Sealed Bearing Tricone Roller Cone Bit Blast Hole Drill Bit, Find Details and Price about Tricone Bit Tricone Drill Bit from 7 1/2'' 190mm IADC 537 Sealed Bearing Tricone Roller Cone Bit Blast Hole Drill Bit - Hejian Hengji Bit Manufacture Co., Ltd.