... , ISO90004) Product rangea) Round and embossed tube O.D. (mm)9.5 , 12.7 , 15.9 , 17 , 18 , 19. 1 , 20 , 21 , 22 ... facilities , bridge handrail ,expressway railing ,bus stop ,airport and gymnasium .9) Attentionproducts all with high quality and competitive price Chemical Composition201202301304316430C ...