6 1/2″ NEW 211 Tricone Drill Bit 3 1/2″ API Construction, Geotechnical, Geothermal, Industries, Mining, Oil and Gas, Waterwell Skills Posted on July 22, 2021 ← 6 1/4″ NEW 211 Tricone Drill Bit 3 1/2″ API 6 3/4″ NEW 211 Tricone Drill Bit 3 1/2″ API →
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