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Amazon.com: 6063 Aluminum Rectangular Tube 1/2" X 1" X .125" Wall 12" Piece : Industrial & Scientific
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Amazon.com: 1"X 3" X 1/8" Wall Steel Rectangle Tube 48" Long : Industrial & Scientific
Masendelk 40 Pack 1-1/2” x 1/2” Rectangular Tube Plug, 38 x 13mm Black Furniture End Caps Plastic Plug Insert for Furniture Foot Chair Legs Tube - - Amazon.com