... floor drain cap, platform scale, covers the grille, stereo, road parking lot, organs, schools, factories and enterprises, stadiums, garden ... , railway guardrail etc.Steel Grating Standardizations: CountriesNational Standards for GratingMaterialsGalvanizing Standards ChinaYB/T 4001.1-2007GB 700-88GB/T13912 ... -1987, Australia: AS1657-1992, Japan:JIS Steel Gratings for walkways construction (manufacturer)