What (in the US) do you call the type of wrench that is made from a steel tube?
This is a tubular wrench.
Apart from the British &quot;box wrench&quot; term, &quot;tubular&quot; is in my experience the most common generic name for these tools. You can get a full set of them (I have one, though in metric sizes).
It looks like googling &quot;tubular box wrench&quot; is the best way to get the right stuff while eliminating the American meaning of &quot;box wrench&quot;.