I don't have many Duro/Indestro items, but here they are.
The big socket set is 1/2" drive; I picked it up a couple years ago for a good price, but have not given it much use. The set isn't complete and there's some duplication. Exterior paint scheme is dark green, and the red interior comes from some previous owner.
The sockets in the rectangular section at right were made to fit square- (not hex-) head bolts. The hex-head sockets I gathered into the middle and left compartments. At right, two of the sockets have 1/2" square heads to slip into the #672 ratchet driver without using the plug-in.
The #672 driver ratchets only one way: you turn it over to ratchet the socket the other way. You need a double-ended 1/2 drive plugin to fit the square hole in the ratchet handle and the square hole in the socket. This must have to saved costs in manufacturing (and price), but I'll bet it was a nuisance in regular use.
The little socket set (decaled by Indestro) uses a hex wrench as driver. The socket that's second from the right is one I picked up on ebay to complete the set, which came from an old Kennedy box owned by my father in law. He trained as a machinist, following his father and grandfather in the trade.
Among many other things in the box, it contains a vee-block he made and signed "Bud Laughlin 1938" — he was 23 at the time.
The three open-end wrenches are:
• P0725B: 9/16 & 1/2
• P????: 1/2 & 7/16 (the 1/2 end on the left has been ground down to make it as thin as the shank
• P21A: 13/32 & 11/32
All are marked "Select Steel," which was an Indestro trademark; the smallest also has "Indestro" stamped in.
Probably everybody here knows of this site but if anyone doesn't, there's lots of Duro & Indestro background info and tool images at —
http://alloy-artifacts.org/duro-indestro.html