... bar pitch;50,100mm 3>Plain,Serrated,I-shape 4>Hot-dipped galvanized,Painted,Untreat steel structure ... Surface Treatment: Hot dip galvanized , Painted , Untreated.3) Shape of bearing bars: Plain bar style , Serrated bar style ... 2) Bearing Bar Pitch (center to center)12.5, 15,25, 30, 30.16, 32.5, 34, 40, ... : kevinYou will get what you want! High tower/Water supply and drainage steel grating(Germany TUV certificated) ...