1.stainless steel grating 2.Metal grating 3.ASTM A123,SS400 4.Common pitch:30mm&40mm 5. ... , A1011, A569, Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self colour, hot dip galvanized, painted, spray coating 6Grating StylePlain / Smooth, Serrated ... -1985, Japan:JIS China: YB/T 4001.1-2007, Stainless steel grating