GL Coils (Galvalume Coils) are steel coils coated with an aluminium–zinc alloy to provide superior corrosion resistance and long-term durability compared to conventional galvanized products. They are manufactured in various thicknesses, widths, and coating specifications as per standard requirements, offering good strength, formability, and surface finish. GL coils are identified by their thickness, width, and coating grade, with weight based on coil dimensions and material density.