for what is used this socket?

[Jure]

like i said in the title...maybe for a butterfly nuts??

 

[87Pomona]

My guess would be wing nuts.

 

[ybnormal70]

Looks like the end of a jack handle. Maybe to lower a jack???

L8r,

Kevin

 

[crankshaftdan II]

For twisting wires closed on sand bags--WAG??

 

[Nelkcots]

Looks like it slides onto the piece just beneath it in the picture.

 

[Bruce Lancaster]

Looks like a wartime 1/4 or 9/32 socket for aircraft hose clamps...assuming it's small.
That one is a major exercise in military logic: People were overtightening hose clamps using the common nut with screwdriver slot design, so the AN clamps were made with a wingnut forcing mechanics to tighten them only finger tight. This of course made overtightening extremely difficult, so a special socket was invented to allow overtightening...

 

[metaleltr]

The piece below is for lapping slotted valves if anyone wanted to know.

 

[Jure]

its part of this 1/2 set

 

[bobcatdan]

Pepcocks on radiators. That is what I use mine on.

 

[jon72vega]

Pepcocks on radiators. That is what I use mine on.

I agree. I made a tool similar to that a couple of years ago.

Jon

 

[mrborohachi]

good for the release valve on cherry pickers

 

[chopper1]

The piece below is for lapping slotted valves if anyone wanted to know.

metaleltr is correct. It is for lapping valves. The set would have also included some flat [different sizes and shaped] blades that would insert into the socket.