<p>[Fit for 1.25inch Eyepieces] Compatible with all 1.25inch eyepieces and telescope focusers [Work with Refractor Telescopes] This diagonal telescope mirror is only suitable for refractor and catadioptric telescopes, not recommended for reflector telescopes [Achieve Optimal Positions] When the diagonal mirror is installed on the vertical axis, you will see an upright image with a mirroring effect (left to right reversal). When installed on the horizontal axis, the image will appear in an upside down orientation. No matter how you install the diagonal mirror, you will get an optimal position for observing landscapes, wildlife, and astronomy [Secure \u0026 Safe Installation] Directly insert the silver end into a 1.25inch telescope and fasten the telescope eyepiece with the screw knob. The copper ring offers great securing strength and keeps the eyepiece in pristine condition free from scratches [Impeccable Image Quality] The diagonal mirror is made of High-quality materials with coatings for crisp and sharp images as well as high color fidelity. The durable construction is suitable for outdoor use Material: plastic+metal colour: Black Package Contents: 1 x Diagonal Mirror Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.</p>