... 4>Hot-dipped galvanized,Painted,Untrea 1.Metal Bar Grating Comprehensive type and broadest range in dimension ... BS4592, AS1657, JS31011.3 Grating Dimension Load Bearing Flat Bar sizeThickness≥3mm, depth ≥19mm19X3,19X5,20X3, 20X5, 25X3, ... bars(mm)12.5,15, 20, 30, 30.6, 32.5, 34, 34.8, 35.3, 40, 60 ... I type, serrated type, serrated I type; cross bar: round type and square twisted type.Standard grating:Steel ...