Description With this diagonal you can match the orientation of the star field with "correct" star maps and charts. It produces an that is oriented properly, which means that the is upright but reversed from left to right. This is a great diagonal for daytime terrestrial use and night time astronomy applications for telescopes or spotting scopes.- 90°Telescope Mirror Features - Color: Black. - Size: 8.50X3.50X4.50cm/3.34X1.38X1.77 inch. - Material: Plastic, glass. - Note: Screw is random style.- Telescope Mirror - Standard inch diameter fits for 0.965 inch eyepiece and telescope focuser. - 90°Diagonal Mirror - Designed for refractor and catadioptric telescopes, and not for reflector telescope.- Optic Mirror - Wide 90 degree angle allows you to view the correct from the refractor telescope stand and just look down at a comfortable angle.-Mirror - Easy to install and use. Just insert into 0.965 inch telescope at the silver end, the other end fixes 0.965 inch eyepiece by the screw.-90 Degree Diagonal Mirror - The body is constructed of materials, sturdy and not easy to damage.- 90 Degree Optic Mirror Wide 90 degree angle allows you to view the correct images from the refractor telescope stand and just look down at a comfortable angle.- 90°Optic Mirror High quality optical prisms inside rather than a mirror which makes your images clear and compatible with sharp.-90°Diagonal Adapter It is manufactured with professional technology to ensure the of the product and can work for a long time.- 90° Mirror More comfortable viewing orientation as you observe from above, filter thread for any 0.965 inch filter.- Diagonal Mirror With this diagonal you can match the orientation of the star field with "correct" star maps and charts. It produces an images that is oriented properly, which means that the images is upright but reversed from left to right.- 90 Degree Mirror