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Amazon.com: 20pcs High Quality 20x20 T Slot L-Shape Interior Inside Corner Connector Joint Bracket with Set Screws for 2020 Series Slot 6mm EU Aluminum Extrusions Profile : Industrial & Scientific
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
V-Slot 20x20 Linear Rail Aluminum Extrusion Profile
20mm x 20mm 6mm T-slot Extrusion Profiles | Automation Werks
20X20 - T-slot - aluminium profile | 3D CAD Model Library | GrabCAD