Aluminum Extrusion (20mm x 20mm) - Clear – Inventables, Inc.
Amazon.com: Silver Aluminum Extrusion 48" (1220 mm) Clear Anodize Misumi Series 5 (20mm x 20mm) - Compatible with All 5 Series Fasteners and Accessories - Infinitely Adjustable for Fast Prototyping - 4 Pack : Industrial & Scientific
Amazon.com: 80/20 Inc., 40-8020, 40 Series 80mm x 20mm Extrusion x 1830mm : Industrial & Scientific
EXM-2020-BLACK – 20mm x 20mm BLACK Smooth T-Slotted Aluminum Extrusion | TNUTZ
10mm x 20mm 5mm T-slot Extrusion Profiles | Automation Werks
TSLOTS TS20-40M 20mm x 40mm 5mm Aluminum Extrusion