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12 1/4 Inch 311mm IADC 537 517 617 637 for Water Drilling Tricone Roller Cone Bit, Find Details and Price about Tricone Rock Bit 105 Kg Tricone Bit from 12 1/4 Inch 311mm IADC 537 517 617 637 for Water Drilling Tricone Roller Cone Bit - Hejian Tianrun Machinery Co., Ltd.