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center bit

noun, Carpentry.
1.
a bit having a sharp, projecting point for fixing it at the center of the hole to be drilled.
Origin
1785-1795
1785-95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for center bit
  • Applications would include horizontal drilling, extended reach drilling, bi-center bit drilling and under-reaming.

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