1.5" x 2.5" x .125" wall 6063T52 Alum Rect Tube - Alcobra Metals
6061 Aluminum Rectangular Tube – Clinton Aluminum
Amazon.com: Kwweeoo Aluminum Rectangular Tubing 2Pcs 25mm x 76mm x 1000mm Long Wall Thickness 2mm, 2 Pack Aluminum Structural Rectangular Tube 1 x 3 x 0.08 x 39.37" inch : Industrial & Scientific