... , painted rectangular, square certificate:CE, ISO9001 square steel tube, rectangular or square, according to standards ASTM A53, ... , ASTM A135, ASTM A500, EN10219, EN10255, EN10240, EN39(BS1139), DIN2440/DIN2444, JIS G3444, BS1387, DIN2394, DIN2395, or ... 300mm, Wall thickness:0.8mm---20mm. PURPOSE: fence tube, structural tube, scaffolding tube, furniture tube and so onCERTIFICATE: ISO9001, UL, FM, CE ...