... ,40mm,50mm Corrss bar:50mm,60mm Bar size: 32x3mm Steel stair tread (factory)Material:low carbon steel bars:30mm,40mm,50mm ... corrss bar:50mm,60mm bar size: 32x3mmSteel stair treadMateral: Low carbon steelDistance between bars 30mmDistance between cross bars ... round twisted barSurface hot dipped galvanizedSize 750mm x 250mm Steel Stair Treads