SUPERIOR PROTECTION - Features scratch-resistant polymer by American Paper Optics, ensuring safe solar observation for your Celestron StarSense Explorer DX 102AZ and Omni XLT AZ 102 telescopes. OPTIMAL FIT - Designed specifically for Celestron StarSense Explorer DX 102AZ and Omni XLT AZ 102 models, this filter boasts an external diameter of 4.72' (120mm) and internal diameter of 4.6' (117mm). ENHANCED VIEWING - Experience solar observation with a clear aperture of 2.08' (53mm), providing detailed views of the sun in a distinct orange color, enhancing your astronomical experiences. ADDED SECURITY - Equipped with three nylon safety screws, this filter ensures a secure and stable attachment to your telescope, preventing accidental dislodging during observation sessions.