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The abbreviation for a kilo-circular mil, or 1000 circular mils (roughly equal to 0.5067 mm). The measurement "kcmil" is also known as MCM, and is often used in wire gauging and cable sizing. The circular mil (on which the kcmil - or MCM - is based) is a unit of measure that describes the area of a circle-shaped cross-section that has a diameter of 1/1000 of an inch. The circular mil is an American measurement, and is hardly ever used outside the United States.