Thank you Jim and Eugene. I would have never guessed but it does look very similar to that photo. The bits are marked 4, 6, 8, and 11. I would have thought wood working but that is why I come to this forum. Good to learn from those with knowledge.
I would guess #2 and #3 is an internal micrometer of sorts... you fit it to an inside dimension, then measure it with regular mics... similar to a snap guage.
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