Square steel tube Material: Q195, Q215, Q235, Q345 Size: 10*10-400*400mm Thickness: 0.2-16mm Length: 4-12m can cut as customers equest. Standard: BS1139, BS1387-BS1385, ASTMA53B, Sch10-40, ASTMA500, API5L, API5CT, DIN2440andEN10219 Package: In bulk, bundles, or PVC; we also can package as customers equirements. Delivery time: 15-30 days Payments/T, L/C We also can provide a lot square/rectangular steel pipe, seamless pipe, angle bar,flat bar, steel strip,PC wire,and so on. We can give you high quality products and lower price.