Features: 1.25 inch 90 degree angle mirror to ensure that the images are upright, but left and right reversed. The diagonal reflector are suitable for viewing celestial-bodies and good for land observation use. Simply insert the erecting prism into the 1.25 "focuser and enjoy upright and right-angled images with your eyepieces. Comfortable observation with 90-degree: Look pleasantly from above into your eyepiece, filter thread for any 1.25" filter and accepts standard 1.25" eyepieces. A more comfortable viewing position and clear images. Specifications: Material:Aluminium Alloy Adapter eyepiece: 1.25inch Refraction angle: 90-Degree Expansion connection: 1.25 "&2" (2 "requires adapter) Reflectivity: 90% Applicable to: refractors Size:Approx.14x9x5cm/5.51''x 3.54''x1.97'' Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Erecting Prism