Hand Tools Archive

Subject:
What drill bits are these?

ER10
I have drill bits that were in my grandfather's tool chest. The drill bits say "Union twist Drill' and they have 3 flutes. He is no longer with us, to ask him about these, so I ask all of you.
I am wanting to learn:
1)what type/or name would be given to these drill bits?
2) Best for wood or metal?
3) how to sharpen them? and it would have to be done by hand, correct?
4) Are they really old?
5) is this three flute style, a dinosaur, and abandoned style? or are these rare and very special?
6) Why the 3 flutes?

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