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center bit

noun
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Definition of center bit

: a bit with a sharp conical or threaded center spur for guiding it, a scorer for marking the circumference of the hole, and a lip for cutting away the wood inside the circumference

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“Center bit.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/center%20bit. Accessed 25 January 2020.

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