Amazon.com: 80/20 Inc., 40-4080-Black, 40 Series 40mm x 80mm T-Slot x 500mm : Industrial & Scientific
40 Series T-Slot Aluminium Extrusion Profile – HOONLY Aluminium Profile
Amazon.com: 4080 Series Aluminum Heavy Duty Inside Connector Bracket Set for 4080 Series Aluminum Extrusion Profile, with 4Pcs L Connector Fasten, 8pcs 4040 T-Slot Nuts, 8pcs M8x20mm Screw. : Industrial & Scientific