... quality products and service.Standard:Strictly follow the ASTM A 554 and others.Features:1) Material of stainless ... Round pipes - Outside diameter(mm) :8,9.5,11,12, 12.7,14.5, 15.9, 17,18,19 ... 133,141,159,2192)Square pipes - Outside dimensions(mm) : 10x10,12x12,15x15,17x17,18x18,19x19,20x20, ... 50x50,60x60,70x70,80x803)Rectangular pipes - Outside dimensions(mm) : 20x10,23x11,24x12,25x13,28x13,30x15,34x22, ...