The Nitecore 25.4 mm filter is designed to fit the Nitecore EA1, EA2, EC1, EC2 and MT2C lights but will also fit similar 25 mm light bezels. Also the NFD25 diffuser is perfect for times when a softer, wide angle diffused flood beam is preferable. Great for close-up and low light applications such as wide area lighting, short distance reading, and camping.