3 thoughts on “Drill bit grooves serve a purpose”

  1. Their called flutes by the way, and of course they are necessary because upon entry a drill removes it’s own volume of material. That particular drill is not the standard two flute jobber length drill that comes in the set with your power drill, you got three christmases ago and lost half the pieces. It is instead a core drill with four flutes indented for high material removal rate but requires a pilot drill.

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