20x40 Aluminum Extrusion - 5 Series, Base 20, One Closed Side | MISUMI | MISUMI
Aluminium Anodised Alluminium Profile T Slot 20 X 40, For Industrial
OUYANG 2PCS V Slot 2040 Aluminum Extrusion Profile 7.87 in European Standard Anodized Linear Rail for 3D Printer and CNC DIY(Black, 200mm): Amazon.com: Industrial & Scientific
2pcs 2040 20x40 BLACK T-slot Aluminum Extrusion Standard Anodized Linear Rail | eBay