Panel mounting 2.2K Ohm linear taper potentiometer mounts in a 0.38" hole in panel with supplied nut. Potentiometer has 0.19" dia. "D" shaft which is 0.6" long. This potentiometer includes a special deluxe black set screw knob that has a cutout allowing you to label your panel with numbers. As the knob is turned a different value (number) is shown. Overall size of knob is 0.15" dia. x 0.75" thick with cut out "window" as shown. You get both items in package!