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12 1/4 Inch 311.15 mm IADC 235 API Tricone Bit for for Water Oil and Gas Drilling, Find Details and Price about Steel Body PDC Drilling Bits Oil Well Drilling from 12 1/4 Inch 311.15 mm IADC 235 API Tricone Bit for for Water Oil and Gas Drilling - Hebei Ruishi Bits Manufacturing Co., Ltd