Coal Boring Bit

Coal Boring Bit

Coal Boring Bit.
Coal Boring Bit. Made from Iron and Tungsten. Size 3 1/2″ x 2 1/4″ inches.

This large sized bit was inserted into the shaft of a long twist drill rod and used to bore holes in the coal for shotfiring. A bit of wire was inserted through a hole in the end of the rod to hold the bit in place.

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