I purchased this Aluminum 6061-T6 Seamless Round Tubing, WW-T 700/6, 3/4" OD, 0.68" ID, 0.035" Wall, 36" Length as an Axyl surround for a Kayak Mobility Cart build I am working on.  It is a great little 36" piece of Aluminum Pipe for this or other uses I may find for it.  With a little effort, you can easily cut it to size or even glue it up with epoxy for use in many ways, that only you can come up with.  If you need a good aluminum, about anything you may need, Small Parts or Online Metals can get it for you.  I love it.