What it is Genuine Sadowsky concentric potentiometer knob set for Sadowsky instruments. Cylindrical design with straight knurled sides and silver indicator lines. Designed for double-shaft potentiometers (stacked pots). Compatibility For double-shaft potentiometers (stacked pots). Please compare the dimensions and shaft configuration with your existing knobs before ordering. Specifications Top Height: 12.1 mm (0.48") Top Outside Diameter: 14.9 mm (0.59") Top Inside Diameter: 4 mm (0.16") Bottom Height: 9.5 mm (0.37") Bottom Outside Diameter: 18.2 mm (0.72") Bottom Inside Diameter: 5.95 mm (0.23") Material: Aluminum Mounting: Set screws, requires 1.5 mm hex key Finish: Black Manufacturer Part Number Sadowsky SKU: SP S 30515 BK What's Included 1 top knob 1 bottom knob Important Notes Please verify the dimensions and shaft configuration of your existing potentiometer before ordering. Related Items Sadowsky Potentiometer Dome Knob – BlackA matching Sadowsky knob for single-shaft potentiometers.