ITEM NAME:Volume Control Rotary Knobs For 6mm Dia. Knurled Shaft Potentiometer Durable Features: Plastic control knob to be assembled to a potentiometer for easier rotation Brass core, ribbed grip, with a min / max or center position marker Knob Height: Approx. 19 mm / 0.75 inch Knob Diameter: Approx. 19 mm (top), 21 mm (base) Shaft Insert Diameter: Approx. 6 mm Material: Plastic, brass Color: Grey Note: Please take note that we have 2 different kinds in stock. (Please refer to the pictures) We will send one kind at random Package Included: 1 x potentiometer knob Keywords: potentiometer knob, control knob.Brass core, ribbed grip, with a min / max or center position marker. 19 mm (top), 21 mm (base).