Products name: black square steel tubes Standard: astm a500, bs en10219, en10210 gb/t3094, gb6728, jis g3466-2010 Material: q195, q235, q345, gra grb, s235jrh, s275joh, s355joh, stkr400, ss400 etc, Outdiameter: 10*10mm-600*600mm Wall thickness: 0.3-25mm Length: 1-16m, or be required Ends: plain ends, Surface:mill finish, galvanized, painted, powder coated Package: packing by plastic bags, bundled by steel strip, or as your demand Delivery time: 1.The products in stock will delivery immediately received the deposit 2.According to the order quantity, the delivery time range from five days to twenty days. Trade terms: 1.Price term:ex-work, fob, cfr, cif, 2.Payment term:t/t or l/c Application: steel structure, building etc. Our services: 1.High quality and service 2.Rich experience in doing business with foreign customers 3.Fast delivery 4.The most comprehensive standards and materials for your choice.