Item Type: 1.25 Inches 90 Degree Zenith Diagonal Mirror Material: ABS, Plastic, Optical Lens Interface Size: 1.25 Inch Viewing Angle: 90 Degrees Weight: Approx. 111g / 3.9oz Package List 1 x Zenith Mirror 2 x Dust Cover 1Standard 1.25 Inch Diameter: 1.25 inches 90 degree zenith diagonal mirror fits for 1.25 inch focuser and eyepiece, works with refractor and catadioptric telescopes, not recommended for reflector telescopes. 2Stable and Reliable: 1.25 inches 90 degree zenith diagonal mirror can be used with refrator telescope and makes the image upright. Though left and right reversed, not affect astronomical observation. 3With Dust Covers: Fully coated lens come with dust cove, keeping your lens clean for superior image fidelity. 4Wide 90 Degree Angle: You can view correct image from refractor telescope stand and just look down with a comfortable angle . 5Durable Material: 1.25 inches 90 degree zenith diagonal mirror is made of aluminum alloy, ABS and plastic material, which is durable.