Easily correct upside down and left-right reversed image: Allow you view things during daytime in correct positionStandard 1.25 inch diameter: Fit for 1.25 inch eyepiece and telescope Designed for: Work with Refractor and catadioptric telescopes,not for reflector telescopeWide 45 degree angle: You can view correct image from refractor telescope stand and just look down with a comfortable angle.Super easy to use: Just insert into 1.25 inch telescope at the silver end,the other end fix 1.25 inch eyepiece by the screw.With dust cover: Always keep your lens clear,prolong life. Material:plasticcolour:blackPackage Contents:1 * 45-Degree Diagonal AdapterOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.