square tube 1.material: Q195-Q235 2.standard: GB/ASTM/JIS/BS 3.specification:15*15mm-80*80mm 4.length:4.8m-9m square hollow section1.material: Q195-Q235 2.standard: GB/ASTM/JIS/BS 3.specification:15*15mm-80*80mm 4.length:4.8m-9m square tube rectangular tube 5.thickness: 0.8mm-3mm We can provide with the high quality,available price,fast delivery and excellent service.