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Metals USA’s standard channels come in sizes from 3 to 15 inches depth of section (MC3 to MC15), 1 and 3/8 to 3 and 3/4 inches flange width, 1/4 to 7/8 inches in flange thickness, 3/16 to 11/16 inches in web thickness, and weights of 4.1 to 50 pounds per foot.