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K&S Engineering 1110 Round Aluminum Tube, 5/32" OD x 0.014" Wall x 36" Long, 5 Pieces, Made in The USA: Metal Industrial Wall Tubing: Amazon.com: Industrial & Scientific
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uxcell 6063 Aluminum Round Tube, 300mm Length 16mm OD 5mm Inner Dia Seamless Aluminum Straight Tubing: Amazon.com: Industrial & Scientific