10ga is short for "10 gauge", a unit of measurement for the thickness of the steel.
10 gauge steel is equal to 0.1345 inches, or 3.4163 millimeters. The thickness is somewhat different for different types of metal (galvanized steel, aluminum, etc.)
ADDITION
As stated earlier, it depends on the steel.
10 ga. clean steel is .1345 inches. Galvanized steel is .1382 inches.
10 ga. aluminum is standard .1345 inches.
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