... BS4592, AS1657, JS31011.3 Grating Dimension Load Bearing Flat Bar sizeThickness≥3mm, depth ≥19mm19X3,19X5,20X3, 20X5, 25X3, 25X4, 25X4.5, 25X4 ... type and square twisted type.1.5 Finishing treatment: a. Galvanized, b. Untreated (black self-color), c. Painted2. 11 sets ... Japan, Germany,Switzerland,etc.4. Capable design can make grating customized according to site requirement. Steel Galvanized Grating