This Harmony XB5 keyed head (key no. 421E) for the key selector switch has 2 positions, operates with key retraction retention in the left and right positions. It has a plastic bezel. This keyed head provides a versatile interface to control your machines. It is easily installed and interchangeable with compatible complete key selector switch assemblies to let authorized personnel safely switch between process or machine modes. It is impact resistant, dustproof, waterproof and vibration resistant thanks to its IP66 and IP66 rating, making it ideal for use in harsh environments.