Dual Binding Posts, Cross Drilled, Accept 4mm Banana, Or Wires

Details

A conjoined pair of binding posts, red and black. 

Shafts are cross drilled to accept bare wire which you screw the knob down onto.

Or use a fork terminal (note that the knobs do not seem to unscrew all the way, so you won’t be able to use a ring terminal).

Or you can plug a banana plug into the end, standard 4mm.  Note that a typical banana plug will not go in “all the way” because the post is not deep enough, it will hang out a bit, banana plugs vary in length so how much or if it hangs out is depending on the plug you use.