Grate gutters are made from flat steel and twisted square steel or welded flat steel and flat steel. They offer advantages such as aesthetic appearance, drainage, high strength, a variety of specifications, and low cost, making steel grating grate gutters commonly used. With the advancement of technology, a new composite water grate is formed by using steel rebar for reinforcement and inorganic fillers, made of resin or plastic. The benefits include a lower weight compared to cast iron water grates and lower cost, but the drawback is that the strength is not as high as that of cast iron water grates.