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The square shank suggests its for a bit and brace not a lathe?

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Clearly a cutter that can be adjusted inward

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Sliding part appears to be a square dovetail

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Patent date Dec 5 1911 perhaps.

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This photo is a bit fuzzy, sorry.

I have no idea what this tool is - listed at https://www.trademe.co.nz/3703975458

Best guess is a groove cutter for a hand drill?

  • 1
    Could be a tubing cutter, but with a limited length for the part that can be cut off.
    – FreeMan
    Commented Jul 30, 2022 at 0:09
  • 1
    That square tapered end will fit a drill brace. I can't imagine what trade this tool is for.
    – Jasen
    Commented Jul 30, 2022 at 0:52
  • 1
    Inside of part with blade looks circular, like it should slide over a a round metal rod. Perhaps this is a manual threader for thick rods? Put into some machine and pushed onto rod to cut threads?
    – Chris
    Commented Jul 30, 2022 at 1:12
  • 1
    Reddit has a sub known as "what is this thing" that may provide an accurate answer in surprisingly short time.
    – fred_dot_u
    Commented Jul 30, 2022 at 10:25
  • 1
    Looks like its for boring a hole in the end of a rod. The rod could be round or square.
    – Hot Licks
    Commented Jul 30, 2022 at 12:52

1 Answer 1


Tenoning tool for a bit brace.

Since it's rather hard to describe how it works in words in a way that makes sense to people unfamiliar with one, I'm resorting to linking a video.

Example in use (of a slightly different design) shown here.

  • 1
    This makes sense the v will hold any rod and the cutter can be adjusted for the size the brace would provide the torque to turn the cutter+
    – Ed Beal
    Commented Jul 30, 2022 at 18:10
  • 1
    Did a bit of googling before and one site(letools?) did have a picture of them. Did look close but was not sure if close enough, did not show the base.
    – crip659
    Commented Jul 30, 2022 at 21:05

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