Everbilt 1-1/2 in. x 36 in. Zinc-Plated Punched Square Tube 803057 - The Home Depot
Round Pole Hollow Shaft Tube Architectural Applications Barra Rod Tube 16mm 16mm | Walmart Canada
Otter Valley Railroad Model Trains - Tillsonburg, Ontario Canada :: Scratch-building :: K&S Engineering 83032 All Scale - 5/16 inch OD Round Aluminum Tube - 0.035inch Thick x 12inch Long
VictorsHome 6063 Aluminum Round Tube, 16mm OD 1mm Wall Thickness 300mm Length Metal Seamless Straight Pipe Tubing for DIY Crafts Model 2pcs : Amazon.ca: Industrial & Scientific