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311mm TCI Tungsten Carbide Rotary Rock Roller Tricone Bit API IADC537 for HDD Well Drilling, Find Details and Price about Drilling Bit Mt Water Drilling Bit from 311mm TCI Tungsten Carbide Rotary Rock Roller Tricone Bit API IADC537 for HDD Well Drilling - Urumqi Siruite Mechanical Equipment Co., Ltd.