... /steel grating for ditch1.Comprehensive type and broadest range in dimension.1.1 Material Q235 , or other equivalent material1.2 Grating ... : YB/T4001, ANSI/NAAMM-MBG531, BS4592, AS1657, JS31011.3 Grating Dimension Load Bearing Flat Bar sizeThickness≥3mm, depth ≥19mm19X3,19X5,20X3 ... , 70, 75, 80, 100, 101.6, 102……The sizes and dimension is not limited to above.1.4 Grating type: flat ...