What is this old Mac Tool?

[Mick56]

On the shaft it has KE6, and there may be something else after the 6, can't tell for sure. The socket is 1/2" and has KU166SJ-1. The hex end is 7/16". I looked through the old catalogs online, but could not find this tool.

 

[Ole Slewfoot]

7/16 hex was common for power drive assembly tools

 

[ecotec]

7/16 hex was common for power drive assembly tools

I think that he is right on. Probably from a factory.