Aluminum

Aluminum 20-2020 Extrusion

https://8020.net/20-2020.html

20-2020
20mm X 20mm T-Slotted Profile - Four Open T-Slots

20-2020 is a 20mm x 20mm metric 20 series square T-slot profile with four open T-slots, one on each 20mm face. The profile is smooth, which makes it  resistant to dirt and debris buildup while also being easy to clean. The 20-2020 profile is compatible with all 20 series fasteners. The 20-2020 profile is part of the smallest profile series 80/20 offers and lends itself to machine guards, work benches, panel mount racks or displays. The four open T-slots enable access from any direction and are useful for mounting accessories.

Price Per Millimeter:
$0.0110

80/20 Brand

80/20 Aluminum Extrusion: What is it? | PennAir
https://pennair.com/2023/02/02/80-20-aluminum-extrusion-what-is-it/

Places to Buy

Cheap T-Slot aluminum extrusion. 6 Places to buy it, and where I got the best deal. : r/vandwellers
https://www.reddit.com/r/vandwellers/comments/76w54c/cheap_tslot_aluminum_extrusion_6_places_to_buy_it/