... -MBG531, BS4592, AS1657, JS31011.3 Grating Dimension Load Bearing Flat Bar sizeThickness≥3mm, depth ≥19mm19X3,19X5,20X3, 20X5, 25X3, 25X4, 25X4 ... is not 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.a.full range in ...