1.ISO90010:2000 2.Hot dip galvanized steel grating, bar grating, stair treads,Ditch cover , tank grating , pavement grating , Steel Grating,Bar Grating,Ditch Covert, Stair Tread,pavement gratingWe ... plain type and serrated type bearing bar is 20 x 3 to 100 x 10;the specification of I-section type ... -4), (11-w-4), (8-w-4) and so on.> 3) Cross Bar Pitch (center to center): 38, 50, 76, 100 ...