Originally Posted by ghost307
They look like the K&T version of bushings to run the separate conductors into an enclosure.

Did I win a kewpie doll??

smile

yup>
[Linked Image from photos.liveauctioneers.com]

the two slotted smaller holes were to screw these jems into the wall, the K&T loom otruded from the two larger outside holes. The 2nd pix shows the face, where the two gooves held the K&T (unloomed) in a downward position.

This allowed the K&T exit from inside a wall to what was most likely (to my knowledge) the original wooden wiremould surface run raceway for K&T