The referenced post illustrates the max and min diameter of the dimple in a sheet on the side that nests with the next part in the stack, in this case a machine countersunk hole, thus is the range of diameters that are needed in the machine countersunk side. The sheet size stops at .040" since this is the maximum practical dimpled thickness.
BTW, after struggling trying to measure the machine countersink diameter with the points of my digital caliper (and a magnifying glass in some cases!) I found "the right tool for the job". Love to have one, can't justify the cost. See page 205.
