The larger the gauge number the thinner the metal.
Car sheet metal 20 gauge.
Commonly used steel sheet metal ranges from 30 gauge to about 7 gauge.
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For example 18 gauge steel according to a gauge conversion chart is 0 0478 inch or 1 214 millimeter.
In most of the world sheet metal thickness is consistently specified in millimeters.
20 gauge became common in more recent times and this meant 0 0359 inch thick metal still a lot to work with in bumping and metal finishing.
This is not a fancy finish sheet but perfect for patches or fabricating brackets or boxes.
No rust no fingerprints from handling no bends or dings.
This sheet metal was delivered in great condition.
20ga is bit tough to crease well with a crappy bender but if you have a decent press brake it should bend nicely.
A gauge conversion chart can be used to determine the actual thickness of sheet metal in inches or millimeters.