... 40mm Bearing Bar Pitch:50mm,100mm Surface Treatment:Steel grating untreated: Allowing quicker delivery to customers ... give a hygienic and clean maintenance free bright finish.Steel Grating Standardizations: CountriesNational Standards for GratingMaterialsGalvanizing Standards ... , A1011, A569, Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self color, hot dip galvanized, ...