Product description Black steel grating is made by welding with flat steel of serrated steel and bars with certain distance. And the surface of the steel grating is untreated. It goes through cutting, edging and other processes. The products enjoy the features of high strength, high strength, light structure, high bearing, convenience for loading and other properties. Steel grating untreated: Allowing quicker delivery to customers whom fabricate and galvanize the grating on their own. Variety:plain/flat steel grating,serrated steel grating. Specification:1000mmx1000mm,1000mmx2000mm,1000mmx5800mm etc. Opening:323/30/100mm,325/40/100,253/30/100mm,255/40/100mm