1.Stainless Steel Grating 2.Certification:ISO9001:2000 3.ASTM A123,SS400 4.Common pitch:30mm&40mm Stainless Steel Grating No.ItemDescription1Bearing Bar25x3, 25x4, 25x4.5 ... 4Material GradeASTM A36, A1011, A569, Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self colour, hot dip galvanized, painted, spray ...