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 KNOB32 - Black Plastic Serrated Top - Yellow Top Photograph Features Suitable for use with Rotary Potentiometers or Rotary Switches Multi-Coloured Available for Easy Indentification Ideal for Mixer Boards Dimensions: Height - 15mm, Diameter - 13mm