... Low carbon steel 2.Top: plain 3.Cross bar: round 4.Standard:ANSI/NAAMM(MBG531-88),BS4592 ... our TaskMaterial:carbon steel or stainless steel,aluminumBearing bar:from 20x3mm to 100x10mm/ I section from 25x5x3mm ... 3mm,40mm,60mm or according to your requirementCross bar pitch:30mm,38.1mm,50mm,100mm or ... bar25x3,25x4,30x3,30x4,30x5,32x5,40x5,50x5,.....75x10mm2Bear bar pitch12.5, 15, 20, 23.85, 25, ...