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