... surface:smooth or serrated 3.finish:black painted,mill,galvanized hot dipped galvanized steel grating 1.Material: SS302,SS304,SS316,SS310,SS314,SS201 ... SS430,SS321 2.Type: W--welded steel grating L-- pressure-locked C-- socket-welding 3.Bearing bar centers: 15-30, 40, 60 ... steps,ditch grates,fences, framedgrates,trash rack grates8.advantage:Light weight, great load-bearing capacity, non-slip and safe, ...