Our company offer: Steel pipe Standard: GB/T6728-2002 ASTMA500 Gr. A, B JIS G 3466 Size: Square pipe SIZE(MM) WALL THICKNESS(MM) 10*10 0.6-0.8 12*12 0.6-0.8 13*13 1.0*1.2 14*14 1.2*4.0 15*15 1.0*1.5 16*16 1.0*1.5 20*20 1.2*4.0 25*25 1.2*4.0 30*30 1.2*4.0 40*40 1.2*4.0 50*50 1.2*4.0 60*60 1.2*4.0 80*80 1.2*4.0 90*90 1.2*4.0 120*120 3.0*8.0 150*150 3.0*8.0 160*160 3.0*8.0 200*200 4.0*8.0 250*250 6.0-12.0 300*300 6.0*12 RECTANGULAR PIPE SIZE(MM) WALL THICKNESS(MM) 12*10 1.0*4.0 30*20 1.2*4.0 40*20 1.2*4.0 50*25 1.2*4.0 50*40 1.2*4.0 60*30 1.2*4.0 60*40 1.2*4.0 70*40 1.2*4.0 70*50 1.2*4.0 80*40 1.2*4.0 80*50 1.2*4.0 90*30 1.2*4.0 100*50 1.2*4.0 120*40 1.2*4.0 200*150 1.2*4.0 300*200 1.2*4.0 Standard length: 6M, /12M GB Grade: Q195 The above are the main supplying sizes. If other sizes outside the list are required, please contact with us. We can supply pipes according to the specific requirement and usage of buyers. Galvanized, black and brighten square/ rectangular pipe are available. Service of painting the pipe with varnish or oil, threading and socket the pipe ande put on plastic cap are available.