...from a Harley Benton 3 way toggle switch, wich is made of plastic.
But the reason I chose this knob was actually to match all the other black chrome hardware from Schaller.
It fitted well in the toggle switch tread, I had previously bought another one in gold as a substitute for the one in a golden HB 3 way toggle switch, and it fitted as well.
Being made of metal, it gives another feel from the plastic ones when you use the switch.
Well made and confortable to use.