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17 1/2 " Tricone Rock Drill Bit 444.5mm Tricone Drill Bit for Drilling Rig Equipment, Find Details and Price about Tricone Drill Bit Rock Drill Bit from 17 1/2 " Tricone Rock Drill Bit 444.5mm Tricone Drill Bit for Drilling Rig Equipment - Glorytek Industry (Beijing) Co., Ltd.