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Amazon.com: METALLIXITY 6063 Aluminum Tube (8mm OD x 4mm ID x 300mm L), Aluminum Round Tubing - for Home Furnishing, Machinery, DIY Handicraft : Industrial & Scientific
Amazon.com: 4mm x 200mm x 200mm 6061 Aluminum Plate Sheet : Industrial & Scientific
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Amazon.com: M4 4mm Flat Head Aluminum Rivet Nut Blind Insert Nut Pack of 100 : Industrial & Scientific