A. Material: The Push Button Cover is made from pp material, which is sturdy and wear resistant, not easy to break. It has an opening hole of 22mm and is designed for extended use. B. Protection Function: The Emergency Stop Button Cap can effectively prevent the emergency switch from dust and accidental contact, providing comprehensive protection. C. Installation: The dustproof Button Guard is easy and fast to install without the need for professional tools, allowing for easy installation on the button. D. Additional Features: The Switch Cover Protector is waterproof and dustproof, suitable for use in outdoor or wet environments, making it a safe and reliable switch cover. It can also be used for computer PC power buttons, desktop buttons at home, and in offices. Specification: Material: Pp Size Chart: 4.3 cm x 3.9 cm x 1.65 cm/1.69 inch x 1.54 inch x 0.65 inch Package Includes: 1xPush Button Cover Guard Note: Please allow slight errors of 1-2cm/0.39-0.79inch due to manual measurement.