Check the listing for details. 20Pc 4*6mm Insert D Type Shaft,Plastic Potentiometer Rotary Knob Pots. Condition: New. Listed at 13.87 USD. D type ShaftProduct Details1.Size:15x13.5mmmm/0.59x 0.53-inch(D*H);Replacement part for audio device, 4x6mm D type shaft can be push on it easily.2.360 degree rotary knob for easily control the potentiometer.Easily adjust,widely applied to control the effect of a variety of functions, such as level, speed, voice, etc.Can be used for synthesizers, electric guitars, etc.3.Electronic Control Potentiometer Knob For 4x6mm Diameter D type Shaft,Volume Control Knob, Audio knob, Guitar Knob，Electric Guitar Knobs，Encoder Code Switch Knobs4.Material: plastic, durable, exquisite workmanship, easy to carry and use.5.Note：In order to make the rod and knob sleeve tighter, the actual hole diameter will be slightly less than 6mm. When using, you need to push the knob hard.