Prototype and fixture making material?

Hello,

I'm looking for ?, I have no idea what's its called.
I need some tubing in the 3/4" to 2" diameter range with the connectors so you can connect the tubing into different shapes i.e. square, box or what ever. I need the connectors so I can make the corner of a box or have 3,4,5 or 6 way tee's if that is what there called. I also need this in metal not plastic. Hope I was not to vague on this.
All help will be much appreciated.

Bruce Klawiter


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