Premium Material: The Push Button Cover is made from pp material, is sturdy and wear resistant, not easy to break, opening hole 22mm, and ensures a long time to useProtective Cover: The Emergency Stop Button Cap can effectively prevent the emergency switch from dust, and prevent accidental contact, providing comprehensive protectionEasy Installation: The dustproof Button Guard is easy and fast to install without professional tools required, it can be easily installed on the buttonWaterproof and Dustproof: Switch Cover Protector is waterproof and dustproof, it can for used in outdoor or wet environments, is a safe and reliable switch coverMultifunctional: Emergency Stop Button Cap can be used for computer PC power button, desktop button at home, office 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 slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.