... grating 3. Easy installation & saving work time. Advantages of steel grid plank: light weight, strong intensity, big load capacity, transmission and ... 100mm; of which 50 and 100mm arerecommended3) Advantages of steel grid planks: light weight, strong intensity, big load capacity,transmission and ... -1985,Germany: DIN24537-1-2006, Japan:JIS bar steel grating grid drain trench covers (factory)