It was in a pile of tools given to me. Google spanner wrenches and you will find a bunch of choices much nicer than mine. From my picture you can see it is made out of thin metal; you could easily make one for yourself with a grinder and a file.

1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix