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steel stair treadSteel Grating standard: CHN - YB/T4001-1998USA - ANSI/NAAMMMBG531-88ENGLAND - BS4592-1987AUSTRALIA - AS1657-1992Steel Standard: CHN - GB700-88Hot Galvanized Standard: CHN - GB/T13912-92        The Specification of Steel Grating(Un-incised):Size:1M×6M Standard (Any specialized by Customer's design or USA standard)Material:Mild SteelSurface Treatment: Un-Coated, Painted, Hot GalvanizedType: Plane Type or -Serrated TypeQuality Control: