... 100mm 4.ISO9001 Pool Cover GratingPool Cover Grating is made by the world first-class Italian ORSOGRIL equipment ... arrange the bearing bar and cross bar in longitude and latitude order to certain distance . ... bar by high tension resistance welding ring which is controlled by computer, So we can produce ... 5*5,6*6,8*8mm4. Bar grating is widely used in the platform, corridor, bridge, well covers, stairs ...