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API 7 1/2" IADC637 TCI Tricone Bit for Water and Petroleum Well Drill, Find Details and Price about 7 1/2" IADC 637 TCI Tricone Bit TCI Tricone Bit from API 7 1/2" IADC637 TCI Tricone Bit for Water and Petroleum Well Drill - Hejian Deris Petroleum Drilling Equipment Co., Ltd.