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Possibly taper gauges? They look to be different tapers, perhaps with a standard handle that goes on the threaded end.

On a couple of them you can see cylindrical score lines as if they had been fit to a matching female taper and turned. However, they don't have a gauge line, which would be typical of taper gauges, so . . . ???

Another possibility . . . test plugs (assuming these have a hole through the center).

Would have been nice to have something for a size reference.
 
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