ALUMINIUM ROUND BAR/ROD 4,5,6,8,10,12,16,20mm diameter (in many Lengths) | eBay
Ks-Tek 20mm Aluminium Cap for Crimp Glass Vial Aluminium Sealing Top (Green) 100pk: Amazon.com: Industrial & Scientific
6Pack 6.6FT/2 Meter Plaster-in LED Drywall Aluminum Channel with Flange for 12mm Strip Lights, Recessed Aluminium LED Profile with Clip-in Diffuser and End Caps: Amazon.com: Tools & Home Improvement
Amazon.com: H&R Aluminium Wheel Spacers DR 20 MM 202345714 : Automotive
Amazon.com: Front Fork Barrel Shaft, 20mm to 15mm Front Hubs Tube Shaft Axle, Aluminium Alloy Accessories for Bicycle(100 Open Gear) : Industrial & Scientific