Amazon.com: 8020, 1050, 10 Series 1 Inch x 0.5 Inch T-Slotted Aluminum Extrusion One Channel Linear Slot Bar Rail 80/20 (24" Long, Clear Anodize) : Industrial & Scientific
E3045-C C CHANNEL T-SLOT EXTRUSION(Cut To Length)
Everbilt 1/2 in. W x 1/2 in. H x 96 in. L Aluminum C-Channel with 1/16 in. Thick 802657 - The Home Depot
Aluminum Channels: Types of Channels, Finishes, Types of Aluminum, and Characteristics