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The 30 * 40mm aluminum alloy square tube is a sturdy and durable model frame material, which can be used for DIY robot car body or self-made 3D printer. This product is easy to drill and can be freely transformed into various personalized DIY accessories. There are a variety of spot lengths available.Section width: 40mmSection height: 30mmProduct wall thickness: 2mmSingle length: 150mm, 400mm, 1000mmProduct material: 6063 aluminum alloy