Check the listing for details. Potentiometer Control Knob Insert Shaft Switch Knobs 6mm/Black. Condition: New. Listed at 8.73 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 Rheostat, Variable Transformer, Potentiometer, and so on.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: Plastic AluminumPanel Mounting Hole Dia: 10mm / 0.4"Panel Dia: 40mm / 1.57"Knob Size: 26.5 x 15mm / 1.04 x 0.59" (D*H)Shaft Hole Diameter: 6mm / 0.23"In the package of: 1 Pack x Potentiometer Rotary KnobEasy 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.