3" X 3" T-Slotted Aluminum Framing Extrusion - Alufab Inc.
Aluminum Extrusion End Cap (for 20x20) - pack of 10 : ID 1156 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits
TSLOTS TS15-15VL 1.5" x 1.5" VeryLight .32" Aluminum Extrusion
80/20 Inc. 72 Inches Long x 1-1/2 Inches Wide x 3 Inches High, T Slotted Aluminum Extrusion 2.0798 Square Inches, Black Anodized Finish 1530-BLACK-72 - 61998571 - Penn Tool Co., Inc
8020, 1010, 10 Series 1 Inch x 1 Inch T-Slotted Aluminum Extrusion DIY Extruded Linear Slot Bar Rail 80/20 (24" Long, Smooth, Clear Anodize): Amazon.com: Industrial & Scientific
1.5" x 1.5" Lite Smooth Bi-Slot Aluminum Extrusion – Faz-Store
50mm x 50mm T-Slotted Aluminum Framing Extrusion - Alufab Inc.
E1002S-C - 1" x 1" BI-SLOT SMOOTH ALUMINUM EXTRUSION(Cut to Length)
8020, 1020, 10 Series 1" x 2" Aluminum Extrusion x 48" Long Extruded Rail T Slotted 80/20 Profile: Shelving Hardware: Amazon.com: 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
TSLOTS TS15-75 1.5" x 3/4". .32" Aluminum Extrusion
1515 Cutting Aluminum Extrusions 50/100/200/500mm/1000mm Used In Assembling Device | m5stack-store
1.0" x 1.0" Smooth T-Slotted Aluminum Extrusion – Faz-Store