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22 Inch IADC 517 537 617 637 for Drilling Water Well Tricone Roller Cone Bit, Find Details and Price about Tricone Rock Bit 105 Kg Tricone Bit from 22 Inch IADC 517 537 617 637 for Drilling Water Well Tricone Roller Cone Bit - Hejian Tianrun Machinery Co., Ltd.