Grid gratings, also known as steel grating, are made by crossing flat steel bars at specific intervals with crossbars (twisted square steel, square steel, round steel, flat steel, etc.) and welding them into a steel product with square openings in the middle. Steel grating is primarily used for drain covers, structural platform panels, and stair treads. The crossbars are usually made of twisted square steel. Steel grating is generally made of carbon steel, with a hot-dipped zinc coating to prevent oxidation. Stainless steel can also be used. Steel grating features ventilation, lighting, heat dissipation, anti-slip, and explosion-proof properties.