... pitch:30mm crossing pitch:100mm bar thickness:3mm Factory price galvanized steel grating 1)Bearing bar pitches maybe 1.5 to 15 ... 30,38,50,76mm and 100mm are recommended.3)Type:Plain , serrated, "i", press-locked4)Material specification: ASTMA36,BS4360,JISG3101&SS4005 ... -dipped galvanized,electro galvanized,painted,untreated hot dipped galvanized steel grating