Source silver anodized extruded aluminum u channel trim with flange on m.alibaba.com
Outwater Outwater Mill Finish 1/8'' Inside Dimension Aluminum U-channel 36'' Length (pack Of 4) Alu757-m C-channel in the Furniture Moulding department at Lowes.com
U-Shaped Metal Edging - Call for Pricing | Eagle Mouldings
Aluminum Channel - 1-3/4" Leg x 1-3/4" OD x 1-1/2" ID x 1/8" Wall - Eagle Aluminum