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It depends on whether you are referring to sheet metal, wire or a shotgun. For sheet metal, 20 gauge is a thickness of 0.0359 inches (steel), 0.0396 inches (galvanized steel) or 0.0320 (aluminum). In American Wire Gauge (AWG), a 20 gauge wire is 0.032 inches (0.813mm) in diameter. A 20-gauge shotgun is a caliber of 0.615 inches (15.621mm).

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Q: How big is 20 gauge?
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