4pcs 150mm T Slot 2020 Aluminum Extrusion European Standard Anodized Linear Rail for 3D Printer Parts and CNC DIY Black(5.9inch): Amazon.com: Industrial & Scientific
1000mm Silver T Type 2040 Aluminum Extrusion Profile European Standard Anodized Linear Rail Guide (5PCS 1000mm (39.4inch), Silver) - Walmart.com
30mm x 45mm 10mm T-slot Extrusion Profiles | Automation Werks
8020, 3075, 15 Series 3" x 0.75" Aluminum Smooth T-Slot Extrusion x 36" Long T Slotted Extruded 80/20 Profile - Shelving Hardware - Amazon.com