Can you help me identify these sockets?

[bfm336]

I've searched the forums for knurled sockets but didn't see the same ones. Any thoughts?

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[arz71]

Seen knurled extentions like MAC sells?

But never seen knurled sockets.

 

[vintage nut]

A lot of new Britain was knurled. As was some old gray. I got a whole set of circle H craftsman sockets like that, nice old ones.

you can never have too many tools

 

[930dreamer]

Indestro-Duro trapezoid logo.

http://home.comcast.net/~alloy-artifacts/duro-indestro-p2.html

 

[lbgradwell]

Duro.

 

[twertsy]

They are Duro

 

[bfm336]

Awesome guys, thanks for the help. I recognized what someone called the "dual trapezoid" but I wasn't sure what is was (just remembered it being a thing).

Funny thing is in the whole set that is the ONLY one with those marks. Any idea why?

 

[bob15]

The other could be made by other companies.

Bonney, Herbrand (USA), Billings, Mac, New Britain all has knurling on some of their sockets (and not to distinguish the metric sockets like Mac did).

 

[bfm336]

The other could be made by other companies.

Bonney, Herbrand (USA), Billings, Mac, New Britain all has knurling on some of their sockets (and not to distinguish the metric sockets like Mac did).

If you look at the second picture you'll notice the edges end fairly quickly as they go into the socket (hard to describe). Does this give anything away? These are 1/2" dr and most are 12pt (the one pictured is 8 pt).

 

[Charles (in GA)]

Indestro-Duro trapezoid logo.

http://home.comcast.net/~alloy-artifacts/duro-indestro-p2.html

Figure 33 and 34 specifically.