Replacement part for audio device, 6mm round shaft can be push on it easily. 360 degree rotary knob for easily control the potentiometer. Size: 44.5*19.5mm Fit for Shaft Hole Diameter:6mm/0.24 INCH Color:black Potentiometer Rotary Knob is useful for connect the rotary Potentiometer, usually multiturn linear potentiometer which always use as volume control switch. Just potentiometer knob, potentiometer is not included here. Product Name: Potentiometer Rotary Knob Material:Plastic Type: Screw Tightening Package Content: 1 Pcs x Potentiometer Rotary Knob Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.