Check the listing for details. Potentiometer Knob Knurled Shaft Insert D Type Switch Knobs, [for Audio Device]. Condition: New. Listed at 11.87 USD. About the product:The potentiometer knob refers to the twist knob installed on the potentiometer, which is mainly used for the volume. Widely used in multi-turn linear potentiometers, audio equipment, most potentiometers on the market, etc.Good choice for you:The knob has a knurled design around it, which can increase friction when turning and is not easy to slip off.Specification:Material: PlasticShaft Hole Diameter: 6mm / 0.24"Size: 15 x 13.5 mm / 0.59 x 0.53" (D*H)In the package of: 20 Pack x Potentiometer Rotary KnobsEasy to install:You just need to insert the potentiometer directly. Fast and convenient installation fastening, smooth rotation, positive rotation.Tips:Please kindly note that the potentiometer is not included here.