... strength 3:Acceptable elongtion 4:Full-range after-sale serviceName1000 series aluminium tubestandardBS, GB, ASTM, JIS, DIN, ENcertification ISOthickness0.45-3mmOuter ... diameter4-30mmgrade1000 and 6000 seriescoloursilver,golden ,black,red, blue. etcsurface treatmentpolished ,anodized,mill ...