1. APPLICATION: This zenith mirror is suitable for 1.25 inch eyepieces and 0.965 inch telescope focusers. Designed for refracting telescopes, not for reflecting telescopes.2. 90 DEGREE ANGLE: This 90 degree diagonal zenith mirror works with refracting telescopes to hold the image upright, albeit upside down from side to side, without interfering with astronomical observations.3. FULLY COATED LENS: Zenith lenses are equipped with fully coated lenses with a dust cover to keep the lenses clean and make viewing images clearer.4. EASY INSTALLATION: This zenith mirror is easy to install and use. Simply insert one end into the 0.965 inch telescope and screw the other end to fix the 1.25 inch eyepiece.5. MULTIFUNCTIONAL APPLICATION: This diagonal mirror is for celestial observation and can also be used for terrestrial observation. By using the zenith mirror, users can easily observe the sky or the ground.Specification:Item Type: Zenith MirrorMaterial: Metal, Plastic, Optical LensesWeight: Approx. 109g / 3.8ozInterface Size: 1.25 Inches, 0.965 InchesViewing Angle: 90 DegreesPackageList:1 x Zenith Mirror2 x Dust Cover