... .surface:smooth or serrated 3.finish:black painted,mill,galvanized hot dipped galvanized steel grating 1.Material: SS302,SS304,SS316,SS310,SS314,SS201 ... . with 50, 100mm recommended. 5.Surface treatment: G - galvanized,P - painted,U - untreated6.Grating standard:1)China: YB/T4001.1-2007(YB ...