This erecting eyepiece flips the you see right-side-up. As you may know, Reflector Telescope use mirrors to collect light which means they usually project an "upside-down" . When you are looking into space, this is insignificant because there is no upside-down in Space. However, if you want to use you telescope during the day to look at things here on Earth, you will probably want the flipped back the right way.This eyepiece is compatible with any telescope or optical device that uses a standard 1.25 inch diameter eyepiece. Your is inverted and magnified 1.5 times.Use Your Reflector Telescope For Daytime Viewing.Flips Images Right-Side Up.Great Add-On For Telescope Beginners.Random appearance and color of screws, don't accept the specified color.Colour: blackMaterial: plasticSize: 170x40x40mmPackage Contents:1 * Barlow LensOnly 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.