Before we go into the uses of aluminum coil, it is important to understand what it is. An aluminum coil is a piece of aluminum roll, as opposed to a flat sheet. It has a hollow cylindrical core that is wound around the coiled material. This allows the inner diameter of the coil to be formed. Coils can be pre painted, diamond-coated, heat-treated, and non-heat treated. Here will talking uses of aluminum coils.