Amazon.com: 1pc 12mm Tubing 11mm tube 10mm Metal Tube 9mm Round Tube 8mm Stainless Steel 7mm tube Water tube (Size : 20cm, Color : OD12mmxID10mm) : Industrial & Scientific
Amazon.com: Tynulox 6061 Aluminum Tubing, 1" OD Seamless Aluminum Round Tube, 0.12" Wall x 12" Length Metal Straight Pipe for Diy, Industry, Decoration, 2Pcs : Industrial & Scientific
Metal Threaded Star Type Insert for 1" OD Round Tubing - Threaded Tubing Inserts Threaded Tube Inserts Round Tubing Inserts Chair Leg Threaded Star Tube Insert Threaded Inserts 3/8-16 (4): Amazon.com: Industrial