... 30,40,60mm 2>Cross bar pitch;50,100mm 3>Plain and Serrated 4>Hot-dipped galvanized Galvanized steel grating 1) ... Material: mill steel black, hot dip Galvanized and stainless steel grating. 2)Types: Plain Style Steel Grating, Serrated Style Steel Grating ... trench cover, sump cover,compound gratings, storage shelves, ladder, fences and handrail,etc. Plain/Serrated and Hot dipped galvanized steel grating