The term “metal coil” may refer to components used in a variety of industrial applications and products, such as: Magnetic coils, Motor & Generator coils Telecommunication coils (antennae, transponder coils, etc.) Coil springs Heating/cooling coils, Medical wire coils, Tube/pipe coils, Solenoid coils Sheet metal coils, and more. For purposes of this article, the term “metal coils” will be used to refer to sheet metal that is supplied in a coiled form. Metal coils come in steel, copper, bronze, and many other alloy types, and can be bought in specific lengths, widths, gauges, and surface finishes.