... ;50-100mm 3.Plain, I-shape, Serrated 4.Galvanized, Black, Steel Grating Size fields:1) Bearing Bar (Load Bar) Specifications (mm): The ... , 100mm are recommended, America standard is available.4) Steel grating Material: Mild Steel (Low Carbon Steel) or Stainless Steel5) Surface Treatment: Untreated, Painting ,Powder ... , water plant, defense project, chemical factory and so on. Metal steel Grating