(1)high strength, (2)light structure, (3)good appearance (4)durable in use HDG steel grid/steel grating for ditch1.Comprehensive type and broadest range in dimension.1.1 Material Q235 , or other equivalent material1.2 Grating Conformity Standard: YB/T4001, ANSI/NAAMM-MBG531, BS4592, AS1657, JS31011.3 Grating Dimension Load Bearing Flat Bar sizeThickness≥3mm, depth ≥19mm19X3,19X5,20X3, 20X5, 25X3, ...