You can also use them on a surface place for inspection set-ups.
OR
Lets say I've just finished cutting a part with a pocket on each side of the part. I need to measure the floor thickness, but can't get a mic or caliper in there to measure it. The pocket is 1.5 inch deep on both side, I could place the 1-2-3 blocks, one on each side standing on their 2 inch sides. measure over the blocks and subtract 4 inches from the reading, thus giving me the thickness of the floor..
Later,
Jack
P.S. I hope that made sense.
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