Identify this Williams piece

[tschmitt]

Found this in a box of tools I won at an auction awhile back. Cant find anything on the internet about it. Number is HX-151. It has a 3/4" end on one side and a 1" size end on the other.
Maybe one of you guys knows what it is

 

[G_P]

Size changing adapter for a female drive ratchet?

 

[lbgradwell]

Size changing adapter for a female drive ratchet?

Correct.

Intended for use with the old 3/4"-female-drive H-50 ratchet.

 

[tschmitt]

Cool, thanks guys

 

[unslow1]

This guy had the other part.

http://www.garagejournal.com/forum/showthread.php?t=105780

 

[Hawk321]

Also found on old style torque wrenches.