1. Potentiometer Rotary Knob is useful for connect the rotary Potentiometer usually multiturn linear potentiometer which always use as volume control switch. 2. A type potentionmeter volume switch clockwise and anti clockwise rotary control. 3. Replacement part for audio device 6mm shaft can be push on it easily. 4. 360degree rotary knob for easily control the potentiometer.