6 Inch Core Bit Extension. This extension shaft is for use on core drill machines and dry core bits with 5/8"-11 thread. Easily extends the drilling depth to 6" deep. Use this on a Core Drill to a 5/8"-11 male thread to 5/8"...

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6 Inch Core Bit Extension. This extension shaft is for use on core drill machines and dry core bits with 5/8"-11 thread. Easily extends the drilling depth to 6" deep. Use this on a Core Drill to a 5/8"-11 male thread to 5/8"-11 female thread.

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