Can any body help with the use of the attached tBergeon Tool 's use Holes are marked 3 to 30

Wheel Pivot Diameter Gauge?

How about a wire gauge.

Good thoughts.
Does anybody have an old catologue?
Perhaps with a discription

The size of the holes increases with the numbers, which lets out wire gauge.

The diameter of the wire increases with lower gauge number.

Perhaps you can detemine the size of one hole with a small drill bit. I guess the numbers indicate the diameter in hundredths of a milimeter

Gerald