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17 1/2" (440.5mm) IADC617 Tricone Drill Bit, Tricone Rock Bit, TCI Tricone Bit for Well Drilling, Find Details and Price about Tricone Bit Three Wing Tricone Bits from 17 1/2" (440.5mm) IADC617 Tricone Drill Bit, Tricone Rock Bit, TCI Tricone Bit for Well Drilling - Guangzhou International Technology Co., Ltd.