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Coavoo 4040 Aluminium Extrusion 500mm Length T Slot black, （2Pcs / Pack） Aluminium Profile 40mm x 40mm 40 Series European Standard Anodized Frame for 3D Printer Parts and CNC DIY

Iverntech 1pcs 500mm 4040 European Standard Anodized Black Aluminum Profile Extrusion Linear Rail with 40 Series 8mm Slot for 3D Printer and CNC DIY Laser Engraving Machine