Shell bit

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a tool shaped like a gouge, used with a brace in boring wood. See Bit, n., 3.

See also: Shell

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
My bucket of shell bits sits beside me in the studio and when I need another shape to try I just pick up a handful of shell bits.