What is this Duro socket set?

[autobon7]

This is how the seller is describing...
Old socket set. Basically big allen wrenches that fit sockets. 11 socket and 3 wrenches plus holder.
All pieces work together, not sure if they are all Duro though. Holder marked Duro 500 and I think one allen is marked Duro 300.
Price is for everything and negotiable.

1- 7/16"
2- 1/2"
2- 9/16"
1- 5/8"
1-11/16"
1- 3/4"
2- 7/8"
1- 15/16
Have not seen a set like this before, anybody?

 

[Kirbot]

I've seen a few sets like that.
It looks like this one is missing the ratchet.

Not something I would get too excited over, unless you collect Duro.

 

[tigmusky]

I rember my dad had one in the garage it was green. They hit the scrap nicely

Daye

 

[mrholeshot]

I have the 1/4 drive version with drive handle. They use to sell those in Farm supply stores for like 50 cent to 1.00

 

[Elroy]

These have been discussed here a few times before.

Here is a tread from 2008 that has some additional information

http://www.garagejournal.com/forum/showthread.php?p=204781

You can see here how these hex drive kits came in several different configurations. They were a very "economical" set. On the other hand Indestro also offer professional level tools as well. Which kit would you rather use?