Gosky 1.25 -inch 45 Degree Erecting Image Star Diagonal Prism for Refractor and Catadioptric Telescope 1. For 1.25'' focuser and eyepiece; Work with Celestron, Orion, Meade, Skywatcher and other brand telescopes which uses 1.25inch accessories., 2. Large Quality Prism inside--allows more light transmission and delievers a clear image. 3. Delievers Erecting Image. Not upside down 4. 45 degree angle - comfortable for observation. 5. Warranty: 1. This is an amazon prime product, easy to return and have a refund if you do not like it. 2. 365-days free exchange warranty. If any part goes wrong within 365day, just contact us by "contact seller"in our amazon shop with your order ID,we can send a new one to you freely.