... -class Italian ORSOGRIL equipment .which can arrange the bearing bar and cross bar in longitude and latitude order to certain distance .Cross ... : 20*3, 25*5, 25*3, 30*3, 32*5, 40*5, 50*5, 65*5 etc.Cross bar: Q235A or ... *5,6*6,8*8mm4. Bar grating is widely used in the platform, corridor, bridge, well covers, stairs.5. Ventilation, light leakage ...