... : hollow section 2Outside Diameter(mm): 10mmx10mm-500mmx500mm 3Normal Diamater(mm):1/2, 3/4,1.1-1/4,1-1/2,2.2-1/2,3 ... ,4,5,6,7,8,9,10,11,12,14,16 4Thickness(mm):0.2-40mm 5Length ... cooperation asap.Waiting for yur early reply. ASTM A500 HOLLOW SECTION