... , plain, I bar , ISO9001 CMPY, GRATING SPECIALIST, Mr.David +13757445098 metal outdoor stairs,hot dip galvanized steel grating , steel ladder, steel ... , 120mm, 2'' & 4'' etc (Mr. David Huang)4Material GradeASTM A36, A1011, A569, Q235, S275JR, SS304, SS400, Mild steel & Low carbon steel ... -1985, Germany: DIN24537-1-2006 Japan: JIS (Mr.David Huang) metal outdoor stairs