Shaft Potentiometer Rotary Knobs - SODIAL(R) 5 Pcs Black Silver Tone 24mm Top Rotary Knobs for 6mm Dia. Shaft Potentiometer Potentiometer Rotary Knob is useful for connect the rotary Potentiometer, usually multiturn linear potentiometer which always use as volume control switch. A type potentionmeter volume switch, clockwise and anti clockwise rotary control. Replacement part for audio device, 6mm shaft can be push on it easily 360 degree rotary knob for easily control the potentiometer.