2 15/16″ NEW 621 Tricone Drill Bit 4THD NROD Construction, Geotechnical, Geothermal, Industries, Mining, Oil and Gas, Waterwell Skills Posted on July 22, 2021 ← 2 5/8″ NEW 621 Tricone Drill Bit 4THD NROD 3 1/8″ NEW 621 Tricone Drill Bit 4THD NROD →
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