... , JIS, UL, galvanized, painted rectangular, square certificate:CE, ISO9001 square steel tube, rectangular or square, according to standards ASTM A53, ASTM ... A106, ASTM A795, ASTM A135, ASTM A500, EN10219, EN10255, EN10240, EN39(BS1139), DIN2440/DIN2444, JIS G3444, BS1387 ... , furniture tube and so onCERTIFICATE: ISO9001, UL, FM, CE square steel tube