5.9''(150mm) 10PCS V Slot 2020 Aluminum Extrusion European Standard Anodized Extruded Aluminum Profile for 3D Printer: Amazon.com: Industrial & Scientific
150mm T Slot 20x20 Aluminum Extrusion European Standard Silver Extruded Aluminum Anodized Linear Rail High Strength Guide Frame for 3D Printer Parts and CNC DIY Workbench(4 PCS,5.9 Inches): Amazon.com: Industrial & Scientific
Aluminum Extrusion End Cap (for 20x20) - pack of 10 : ID 1156 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits
V-Slot 20x20 Linear Rail Aluminum Extrusion Profile
Profile 20x20 - 6mm slot - GAP Engineering
2 Pcs/Lot 2020 T-Slot Extrusion Assembly 20x20 Strut Aluminum Profile for 3d Printer Metal Frame - AliExpress
2020 20x20 BLACK T-slot Aluminum Extrusion Profile Linear Rail CNC 3D Printer | eBay
2020 20x20 BLACK T-slot Aluminum Extrusion Profile Linear Rail CNC 3D Printer | eBay
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Source European standard 20x20 t-slot aluminum profile for modular automation on m.alibaba.com
Wkooa T Slot Interior Joint Angle Bracket for Aluminum Profile Extrusion 20x20 Slot 6mm With Screw Free Connect Parts - AliExpress
Amazon.com: V-Slot 2020 Extrusion, Linear Rail 500mm (4pcs). T Slot Aluminum Extrusion for Framing, with V Type Slot Upgrade for 3D Printer Parts, CNC Rail, Linear Motion Slide Rails (Silver 20x20 Extrusions) :
T Profile Aluminum Extrusion 20mm X 20mm, For Industrial, Thickness: 2 MM