Feature: 1. Image Correction: 1.25inch diagonal prism easily corrects upside down and left right reversed images, allowing you to see things in the correct position during the day. 2. Wide 45 Degree Angle: The 1.25inch diagonal prism is designed with a 45 degree angle, allowing you to view the correct image from the refracting telescope mount and look down at a comfortable angle. 3. Dust Cover: The 45 degree diagonal mirror prism comes with a dust cover to keep the lens clean at all times, extending its lifespan. 4. Durable Material: The 1.25inch 45 degree diagonal prism is made of plastic, optical glass lens, providing clear and acuminate images. 5. 1.25in Diameter: 45 degree zenith mirror is suitable for 1.25in eyepieces and telescope focusers, easy to use without complicated operations. Specification: Item Type: 1.25inch 45 Degree Diagonal Prism Material: Plastic, Optical Glass Diameter: 1.25 Inches (About 31.7mm). Package List: 1 x 1.25inch 45 Degree Diagonal Prism 2 x Dust Cover