... Serrated,I-shape Galvanized,Painted. Stair Treads Steel GratingSteel Grating, Bar Grating, Serrated Steel GratingMaterial:Mild steel: ASTM A36, BS4360, JIS G3101 ... , municipal administration, parking lot, etc Stair Treads Steel Grating Standard of steel grating: NoItemDescription1Bearing bar25x3,25x4,30x3,30x4,30x5,32x5, ... (Export Manager)Mob: +86- 132 7317 7087 Stair Treads Steel Grating Manufacturer