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295mm Skh537g API 6 5/8reg Drilling Rock Hard Formation Oil and Gas Well Bit TCI Tricone Rock Bit, Find Details and Price about Drilling Bit TCI Water Drilling Bit from 295mm Skh537g API 6 5/8reg Drilling Rock Hard Formation Oil and Gas Well Bit TCI Tricone Rock Bit - Urumqi Siruite Mechanical Equipment Co., Ltd.