@fabs they are never enough :)I don't know if you are in N.A., EU or somewhere else. what I have found is 3/4" black pipe with bessy pipe clamps to be most cost effective way. I have pipes from 36" all the way to 5' long. anything smaller, I use F clamps. I love bessy or other parallel clamps but I just can't bring myself to spend $50+ for a 18" clamp when I can buy nice sturdy pipe clamp of much longer length for 2/3rd of that price.