Descriptions:1.Rotary Knob is useful for connect the rotary Potentiometer, usually multiturn linear potentiometer which always use as volume control switch.2.Replacement part for audio device, 6.4mm round shaft can be push on it easily.3.360 degree rotary knob for easily control the potentiometer.4.Electronic Control Potentiometer Knob For 6mm Diameter Shaft, Volume Control Knob, Audio knob, Guitar Knob Features:Product Name: Potentiometer knobColor: BlackMaterial: plasticFit for Shaft Hole Diameter: 6.4mm/0.25-inchSize: 19x14mm (D*H) Package Content:4Pcs x Potentiometer knob