Most likely thousandths of an inch. As in 0.002"

The arrangement in your picture is very much like one I have that's marked with the full measurements. The 0.020 and 0.025 leaves (being the thickest) are on the outside of the group to protect the rest of the thinner ones.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.