Plant supports (make my own)

I would like to make my own plant supports and have been looking for a supplier for steel reinforcing rods which I believe are known as 'rebar' but I have noticed that the ones I have looked at have a sort of rope effect whereas when you buy ready made supports they are smooth. Am I looking at the right thing? I was thinking 6mm thick is this ok? t.i.a.
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does this help?
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw