There are many ways to draw it but you could start with a larger rectangle. Round one corner with the 2-Point Arc tool and then use Offset on the arc and the two adjoining edges to create a set of edges that are offset by the thickness of the metal. Then erase the unneeded edges leaving the L-shaped face as in my example which you would extrude to width with Push/Pull.
You could also draw a path representing the edge of the piece (I assume front leg and arm rest?) and a rectangular face the size of the end of the stock. Then use Follow Me to create the bent shape.
I can think of several other variations but I’m on my phone now. Too hard to type it all out.