Amazon.com: 20mm OD x 2m Seamless 316 Stainless Steel Tubing : Industrial & Scientific
Amazon.com: 1.25" OD x 1/8" Wall DOM Steel Tube, Seamless, Mild Steel Tubing (10) : Industrial & Scientific
Amazon.com: DOM TUBING 1.50 OD 1.25 ID (1/8 WALL) 2 FOOT LENGTH : Industrial & Scientific
Amazon.com: GeilSpace 6 Pack 3/4" × 36" Pre-Cut Black Metal Pipe, Industrial Steel Fits Standard Three Quarters Inch Black Threaded Pipes and Fittings - Vintage DIY Industrial Shelving (3/4" × 36", Black) :