tubing with square sides not curved available?

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Looking for tubing 3 x 3 x 0.25 inch square that has square edges, all I have found is rounded edges.Is tubing available with square edges?
Reply:everything i'm seeing has rounded edges.might could make your own out of two channels welded together.they make a 3x1.498x0.258  A36 channel.  two of those together would get you 3x3x.25 with square edges.... and you'd get to practice running beads http://www.statesteel.com/SS_structural.pdf  (top of page 3)don't know if that would work for what you need to do .... but that's what i can offer
Reply:Check architectural tubing.   Wagner sell Architectrual tubing,  though not as large as you want.