Galvanized then black powder coated steel tube, 75 inches long with a swage end. The length is from end to end including the swage (the swage is approximately 3" long). The swage end is compressed down to slide inside another length of our 1 3/8 tube (and secured with a self tapping screw). These lengths are typically used to make wide sections.
For example combine two lengths of 75" to make one longer piece of tube.
As posts: These cost about the same and replace the traditional angle steel posts used in gardens. Unlike angle steel posts, these round posts have strength in a complete circle (suitable for side to side strength and also back and forth pressure from animals). They also have a nice gloss black powder coat finish and are nearly invisible from a distance. Attach fencing to these posts with fence ties.