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7 1/2inch190.5mm Milled Tooth IADC117/127/227/315tricone Bit/Rock Bit/Drilling Bit, Find Details and Price about Steel Tooth Bit Tricone Rock Drilling from 7 1/2inch190.5mm Milled Tooth IADC117/127/227/315tricone Bit/Rock Bit/Drilling Bit - Urumqi Siruite Mechanical Equipment Co., Ltd.