... ) Outer diameter: +/-0.15mm b) Thickness: +/-10% of wall thickness c) Length: +/-4.5mm Standard:Strictly follow the ASTM A 554 ... , balcony balustrades,furniture, sanitary wares, kitchen wares)Specifications:1) Round pipes - Outside diameter(mm) :8,9.5,11,12, 12.7 ... ,36x36,38x38,40x40,48x48,50x50,60x60,70x70,80x80 3) Rectangular pipes - Outside dimensions(mm) : 20x10,23x11,24x12,25x13,28x13,30x15,34x22 ...