... /T4001, ANSI/NAAMM-MBG531, BS4592, AS1657, JS31011.3 Grating Dimension Load Bearing Flat Bar sizeThickness≥3mm, depth ≥19mm19X3,19X5,20X3, 20X5, 25X3 ... from Japan, Germany,Switzerland,etc.4. Capable design can make grating customized according to site requirement. Steel Grating Black_Plain I type