Grate gutters are made from flat steel and twisted square steel, or welded flat steel and flat steel. They offer aesthetic appearance, drainage, high strength, a variety of specifications, and low cost, making steel grating grate gutters a common choice. With the advancement of technology, a new composite water grate is formed by using reinforced steel with resin or plastic and inorganic fillers. The advantages include a lighter weight than cast iron gutters and lower cost, but the drawback is that the strength is not as high as that of cast iron gutters.