Hello. Welcome to Futurlec. The electronic components Superstore. To find the component your looking for, either search by Part Number or visit the relative department. Need Help. KNOBS KNOB2 - Black Plastic Round Control Photograph Features Suits 1/4" Shafts Suitable for use with Rotary Potentiometers or Rotary Switches Set Screw for Fixing Dimensions: Height - 16, Diameter - 14mm