... /T4001, ANSI/NAAMM-MBG531, BS4592, AS1657, JS31011.3 Grating Dimension Load Bearing Flat Bar sizeThickness≥3mm, depth ≥19mm19X3,19X5 ... type and square twisted type.1.5 Finishing treatment: Hot dip Galvanized 2. 11 sets of press welded (electro-forged ... , Germany,Switzerland,etc.4. Capable design can make grating customized according to site requirement. Galvanized Steel Grating Serrated_Cut-to-size