This Harmony ZB, metal padlockable guard for emergency stop function has 40mm mushroom head with black color.It is compatible with Harmony XB4 and XB5 mushroom head push buttons.This metal padlockable guard is designed as an accessory to be used with push button to protect and provide a secure manner for authorized staff to operate emergency stop mode when required.It is easily installed and attached to Harmony XB4 and XB5 mushroom head push buttons units.It is impact resistant, dust resistant, water resistant and vibration resistant thanks to its IP66, making it ideal for operation in harsh environments.It is ideal for severe environments, especially applications requiring high impact and vibration resistance.