Amazon.com: 4 FT - 1/4" Aluminum Channel 1/16" Walls x 5/8" High 6063 Alloy T-6 Temper Clear Anodized : Industrial & Scientific
4" x 1.647" x .247" Aluminum Channel – Des Moines Steel Inc.
Outwater Mill Finish 1-3/8'' Inside Dimension Aluminum U-channel 36'' Length (pack Of 4) Alu578-m C-channel in the Furniture Moulding department at Lowes.com
Everbilt 1 in. x 1 in. x 1/8 in. x 48 in. Aluminum Trim Channel 800177 - The Home Depot
Satin Anodized Aluminum Deep J Channel for 1/4" Mirror Support 47-7/8" | Wholesale Glass & Supplies