... YB/T4001, ANSI/NAAMM-MBG531, BS4592, AS1657, JS3101 1.3 Grating Dimension Load Bearing Flat Bar sizeThickness≥3mm, depth ≥19mm19X3,19X5 ... not limited to above. 1.4 Grating type: flat bar: plain type, plain I type, serrated type, serrated I type; cross bar: round ... from Japan, Germany,Switzerland,etc. 4. Capable design can make grating customized according to site requirement. ANY QUESTIONS , PLS FEEL ...