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Gauge
The measurement that denotes either the diameter of a wire, or the thickness of a piece of sheet metal. Wire gauges are set by the American Wire Gauge (AWG) standard, which uses a set of numbers ranging from 0000-40 to represent various diameters, with 0000 being the widest, and 40 being the narrowest. Like the AWG system, the sheet metal gauging standard uses a scale of numbers to denote different metal thicknesses and weights per square foot, with the maximum rating 07 being the thickest and heaviest, and the minimum rating 31 being the thinnest and lightest.