Correct and inverted image from left to right: allows you to view things during the day in the correct positionStandard 1.25 inch diameter: fits 1.25 inch eyepiece and telescope Designed for: working with refractor and catadioptric telescopes, not with reflector telescopes45 degree wide angle: you can see the correct image from the refracting telescope stand and just look down with a comfortable angle. Super easy to use: just insert into the 1.25-inch telescope at the silver end, and attach the other end 1.25 inch by the screw. With dust cover: always keep the lens clean, prolong the service life. Material: PlasticColor: Black Package Contents:1*45 Degree Diagonal AdapterOnly the above package content, other products are not included. Note: The light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3cm.