Hi Guys

Just found a Mystery Object in my Tool Box, that looks like some sort of Socket Attachment for an Impact Wrench but I've never seen anything like it to compare it with

Also Note the Threaded Part has also got a Thread inside it

Any Ideas?

 

Looks like 1/2 drive, hole for lever bar, I would say UNC or even Whitworth thread. I would guess it is some sort of extractor, with the middle paart engaging the thing to be extracted (possibly diesel injector?) and the outer part being the pulling part.
Pic needs a ruler so we can see its size!