... Type Bar Material: Carbon steel, stainless steel, Aluminum no Metal Grating Type: Plain Bar; Serrated Bar; I Type BarMaterial: Carbon steel ... ,Mild SteelSurface Treatment:Un-Coated, Painted, Hot GalvanizedQuality Control:Steel Grating standard: CHN - YB/T4001-1998USA - ANSI/NAAMM (MBG531-88)AUSTRALIA ... (Any specialized by Customer's design or USA standard) Metal Grating