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spur bit

noun
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Definition of spur bit

: a boring bit having one or more spurs which scribe the periphery of the hole in advance of the cutting lips to guide the bit in the proper direction — compare twist bit

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“Spur bit.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/spur%20bit. Accessed 9 Jul. 2020.

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