auger bit
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noun
an auger having a square tang at its upper end and rotated by a brace, used for boring through wood.
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for auger bit
Historical Examples of auger bit
In an auger-bit, both methods of cutting take place at once.
Handwork in WoodWilliam Noyes