... cap, platform scale, covers the grille, stereo, road parking lot, organs, schools, factories and enterprises, ... residence outside the window, the balcony guardrail, highway, railway guardrail etc.Steel Grating Standardizations: CountriesNational Standards ... Low carbon steel, etc5Surface TreatmentBlack, self color, hot dip galvanized, painted, spray coating6Grating StylePlain / Smooth, Serrated /teeth, ...