1. Reliable steel grating supplier 2. Good quality steel grating 3. Easy installation & saving work time. Advantages of steel grid plank: light weight, strong intensity, big ... 30, 38, 50, 76 and 100mm; of which 50 and 100mm arerecommended3) Advantages of steel grid planks: light weight, strong intensity, big ... : AS1657-1985,Germany: DIN24537-1-2006, Japan:JIS galvanized steel grating ladder (factory)