... . 3.independent AutoCAD design 4.ASTM A36 steel1.Steel Grating Standardizations:CountriesNational Standards for GratingMaterialsGalvanizing Standards ChinaYB/T 4001.1 ... , 50mm, 75mm, and 100mm,101.6mm(4").5.Standard Grating Panels Sizes: 3'x12', 3'x20', 3'x24'.6. ... . Serrated:Better non-skid property & safety compared with plain grating. I-Shape:lighter,more economical and practical compared with plain ...