Grating with flat bar according to a certain distance and (twisted square steel>, square steel, round steel, flat steel, etc.) staggered, and welded into a square grid with a middle iron and steel products, steel Grid Banzhu use to do ditch cover plate steel platform, ladder of stepping board. Through the twisted rails commonly used square steel. Grating commonly used carbon steel, hot dip galvanized surface, can serve to prevent oxidation. Can also be made of stainless steel. Grating with ventilation, lighting, heat, slip, explosion-proof performance.