One of the best things I have found for figuring this kind of stuff out is a digital caliper. Once was they were pretty expensive...a Mitutoyo could run you a few hundred$$. But now they are a $20 item coming out of China. They will read in decimals or in mms. In North America, the decimals are more likely to net results. There is a little tail on the micrometer that can be used as a depth gauge. Get the measurement, then off to a google search and see what gauge metal you need.
They also make a good scribe when you are making boxes etc, as long as you are working with edges shorter than 6". Use your $20 set for scribing purposes rather than your Mitutoyo.
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