I have a trailer of heavy square and round,angle and others .
The 2 square tubes are 8" x 6" and both pieces measure .37 inches or 9.5 mm and that is a little more than 1/4 " thick ...and each one is 9 ft long....
The big round pipe pieces vary as these were a large smoke stack in a shop and was cut up to remove it ..so they in sizes and thickness and are about 8 to 9 inches around and the flue is welded on 1 piece of pipe and the piece that is insulated and goes thru the roof is there too....Its all very solid round pipe.....I think in total there is about 35 ft...
.I have other steel so write if you are looking for something...maybe I can help...
..message me thru craigs and give me a good contact number if your interested in anything.....I have a loader to make it easy..
prices vary ...