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8 1/2" Steel Body PDC Drill Bit, 6 Blades 16mm Cutters for Oil Water Well Drilling, Find Details and Price about PDC Drill Bits Steel Body PDC Bit from 8 1/2" Steel Body PDC Drill Bit, 6 Blades 16mm Cutters for Oil Water Well Drilling - Hebei Ruishi Bits Manufacturing Co., Ltd