... .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 ... any question, Please don't hesitate to contact with me hot dipped galvanized steel grating