... >Hot-dipped galvanized,Painted,Untrea 1.Metal Bar Grating Comprehensive type and broadest range in ... , AS1657, JS31011.3 Grating Dimension Load Bearing Flat Bar sizeThickness≥3mm, depth ≥19mm19X3,19X5,20X3, 20X5, 25X3 ... limited to above.1.4 Grating type: flat bar: plain type, plain I type, serrated type ... , serrated I type; cross bar: round type and square twisted type.Standard grating: ...