... 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 ... 50, 100mm recommended. 5.Surface treatment: G - galvanized,P - painted,U - untreated6.Grating standard:1)China: YB/T4001.1-2007(YB ...