Descriptions:Potentiometer Rotary Knob is useful for connect the rotary Potentiometer, usually multiturn linear potentiometer which always use as volume control switch.Replacement part for audio device, 6mm round shaft can be push on it easily.360 degree rotary knob for easily control the potentiometer.Dial Face Plate Fit for Rheostat, Variac, Variable Transformer, Potentiometer, etc.Just potentiometer knob, potentiometer is not included here. Features:Product Name: Potentiometer Rotary Knob & Dial Face PlateColor: Black Material: Plastic AluminumPanel Mounting Hole Dia: 10mm/ 0.4inchPanel Dia: 40mmKnob Size:26.5x15mm(D*H)Knob Fit for Shaft Hole Diameter: 6mm/0.23-inch Package Content: 1Pcs x Potentiometer Rotary Knob & Dial Face Plate