Extrusion, 3 x 3 in Hollow Rectangle flat channel, 4 ft (E7-4)
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Extrusions are made of 6061 T6 aluminum. The frame shapes have a 3/8 inch square top and bottom edge and corners with a thin plate between them. Sort of an I-Beam you can bolt to. The 3/8 inch square is beefy enough to drill and tap up to a size 1/4 inch or 6 mm thread into the sides, top, bottom or end. Tapping the end is particularly useful for constructing frames without use of welding or corner brackets. Of course 6061 is a weldable alloy, if you want or need to weld to it. The downsides of welding include significant loss of strength near the weld and distortion of the parts from welding shrinkage. If you are countersinking socket head cap screws into the squares, the head of a 1/4 x 20 screw is too large and weakens the frame structure. So 10 x 32 or 5mm should be the largest socket head cap screws used if countersinking the heads.
Heads up, this is a large item and may result in a higher shipping cost