Feature:1. 1.25 Inch Diagonal Mirror: Compatible with 1.25in eyepieces and telescopes. Designed specifically for refractors telescopes and not suitable for reflector telescopes.2. 90 Degree Angle: The 90 degree diagonal mirror, when used with a refracting telescope, allows for upright images. Although left right reversed, it does not affect astronomical observations.3. Fully Coated Lens: Fully coated lens come with dust cover, keep your lens clean for superior image fidelity.4. Easy Installation: The refractor telescope diagonal mirror is easy to install and use. It inserts into the telescope with a 1.25in end and secures the 1.25in eyepiece with a screw.5. Durability: 90 degree zenith diagonal mirror is constructed of metal, plastic materials, sturdy and not easy to damage.Specification:Item Type: 90 Degree Zenith Diagonal MirrorMaterial: Metal, Plastic, Optical LensWeight: Approx. 110g / 3.9ozInterface Size: 1.25 InchesViewing Angle: 90 Degrees.Package List:1 x 90 Degree Zenith Diagonal Mirror2 x Dust Cover