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IADC114 17 1/2'' 8 1/2'' Steel Tooth Mill Tooth Tricone Bit for Various Rock Formations, Find Details and Price about Steel Body PDC Drilling Bits Oil Well Drilling from IADC114 17 1/2'' 8 1/2'' Steel Tooth Mill Tooth Tricone Bit for Various Rock Formations - Hebei Ruishi Bits Manufacturing Co., Ltd