... distance .Cross bar is pressed into the bearing bar by high tension resistance welding ring which is controlled by computer, So ... : 50mm or 100mmSteel Bar Grating: material: Q235A or stainless steel plate, General Specification: 20*3, 25*5, 25*3, 30*3 ... Specification: 5*5,6*6,8*8mm4. Bar grating is widely used in the platform, corridor, bridge, well covers, stairs.5. Ventilation, light ...