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Factory Price API 8 1/2", 9 1/2", 12 1/4"Single Roller Cone Bit, Rock Drill Bit for Oil Water or Gas Well Drilling, Find Details and Price about Drill Bit Drill Equipments from Factory Price API 8 1/2", 9 1/2", 12 1/4"Single Roller Cone Bit, Rock Drill Bit for Oil Water or Gas Well Drilling - Hebei Ruishi Bits Manufacturing Co., Ltd