Steel Channel 1-1/4" x 1/2" x 1/8" – OmniSteelSupply
Hillman Steelworks Aluminum Mill 5/8 In. x 4 Ft., 1/16 In. U-Channel | Elitsac, Inc.
Amazon.com: Newhouse Electric 1-5/8 in. 14 Gauge Metal Strut Channel with Slotted Back Electro-Galvanized 2ft. (SC14-2-EG),Silver : Industrial & Scientific