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 Degree Optic 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°Telescope Mirror - Designed for refractor and catadioptric telescopes, and not for reflector telescope.- 90°Diagonal Mirror - Wide 90 degree angle allows you to view the correct from the refractor telescope stand and just look down at a comfortable angle.- 90°Optic 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.- Diagonal Adapter - The body is constructed of materials, sturdy and not easy to damage.- Optic Mirror More comfortable viewing orientation as you observe from above, filter thread for any 0.965 inch filter.- 90 Degree Mirror Adopts precision production to stable characteristics and high reliability.- 90 Degree Diagonal Adapter It is manufactured with professional technology to ensure the of the product and can work for a long time.- Diagonal Mirror Economical 90 degree prisms diagonal for astronomical telescopes and spotting scopes.-90 Degree Diagonal Mirror Coated lens comes with cover; keep your lenses clean for superior images fidelity.-Mirror