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API 8 1/2" Driling Bit, 215.9mm PDC Bit, 4 Blades for Oil Well Drilling, Find Details and Price about Driling Bit API from API 8 1/2" Driling Bit, 215.9mm PDC Bit, 4 Blades for Oil Well Drilling - Weifang Sheng De Petroleum Machinery Manufacturing Co., Ltd.