Outwater Mill Finish 5/8'' Inside Dimension Aluminum U-channel 46'' Length (pack Of 3) Alu347-m C-channel in the Furniture Moulding department at Lowes.com
6063-T52 Aluminum Channel, 0.625" x 0.625" x 0.125" x 72 inches (3 Pack)
Hillman Steelworks Aluminum Mill 5/8 In. x 4 Ft., 1/16 In. U-Channel - Gillman Home Center
Outwater Mill Finish 5/8'' Inside Dimension Aluminum U-channel 36'' Length (pack Of 4) Alu570-m C-channel in the Furniture Moulding department at Lowes.com