Shims
x pieces;
0,00x" = approx. 0.0XX mm
0,0xx" = approx. 0.XXX mm

Does anyone have the specs for these shims?

Note!
Shims are not available anymore.

Alternative: There's an alterative called Lamiblock that consists of 12 layers of steel or brass with a total thickness of 1 mm. Lamiblock is available in different sizes, for example 100x100 mm. As it is really expensive, you are well advised not to loose your original shims.