... :30mm crossing pitch:100mm bar thickness:3mm Factory price galvanized steel grating 1)Bearing bar pitches maybe 1.5 to 15,20, ... .3)Type:Plain , serrated, "i", press-locked4)Material specification: ASTMA36,BS4360,JISG3101&SS4005)Surface treatment: Hot-dipped galvanized,electro galvanized,painted,untreated hot dipped galvanized steel grating