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 Mirror Material: Metal, Plastic, Optical Lens Weight: Approx. 110g / 3.9oz Interface Size: 1.25 Inches Viewing Angle: 90 Degrees. Package List: 1 x 90 Degree Zenith Diagonal Mirror2 x Dust Cover