... is our TaskMaterial:carbon steel or stainless steel,aluminumBearing bar:from 20x3mm to 100x10mm/ I section from 25x5x3mm ... NoItemDescription1Bearing bar25x3,25x4,30x3,30x4,30x5,32x5,40x5,50x5,.....75x10mm2Bear bar pitch12.5, 15, 20, 23.85, 25, 30 ... , 30.16, 30.3, 34.3, 35, 40,41,60mm. US standard: 1"x3/16", 1 1/4 ... widely used around in the world. Round cross bar concrete plain top mild steel grating