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8020, 1010, 10 Series 1 Inch x 1 Inch T-Slotted Aluminum Extrusion DIY Extruded Linear Slot Bar Rail 80/20 (12" Long, Black Anodize): Amazon.com: Industrial & Scientific
4pcs 1000mm 2040 Aluminum Extrusion for Openbuilds-VHB-AC-64