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12 1/4 (311mm) IADC517/537/515 Insert Drill Bit for Rock Formation Oil and Gas Well Drilling, Find Details and Price about 311 Tricone Rock Bit Drill 517 537 515 from 12 1/4 (311mm) IADC517/537/515 Insert Drill Bit for Rock Formation Oil and Gas Well Drilling - Urumqi Siruite Mechanical Equipment Co., Ltd.