Feature: 1. Multi Purpose: The 1.25inch diagonal prism supports connecting filters, and the interior is processed with extinction, which is suitable for astronomical and terrestrial observations. 2. 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. Ease of Use: The 45 degree diagonal mirror prism is easy to use, just plug into the 1.25in telescope on the silver end and screw the 1.25in eyepiece on the other end. 5. Durable Material: The 1.25inch 45 degree diagonal prism is made of plastic, optical glass lens, providing clear and acuminate images. Specification: Item Type: 1.25inch 45 Degree Diagonal Prism Round Angle Material: Plastic, Optical Glass Diameter: 1.25 Inches (About 31.7mm) Package List: 1 x 1.25inch 45 Degree Diagonal Prism Round Angle 2 x Dust Cover