This is very nice knob with metal shell and plactic inside. It feel very good and high quality!
Knobs are a great way to finish off your project and make it easier to adjust the level of your death ray. This knob mates to a 0.25" shaft. The knob slides onto the potentiometer and holds tightly with a strong friction fit.
The main body of these knobs is metal with a plastic insert. The outside is knurled for precise adjustment.
You can use them on the potentiometers, switches, rotary encoder and more.