I'm having difficulty identifying these components. I salvaged them from a diy power supply enclosure from a garage sale. Each of the black leads in the image attached to female connectors on the face of the enclosure. I'm assuming they're transformers of some sort. Any clues would be appreciated.
They’re adjustable power resistors.
You loosen the screw and move the ring to or fro to get the resistance that you want and then tighten the screw.
Probably a dummy load for various supply rails.