[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 , you see an upright image with a mirroring effect (left to right reversal). When installed on the horizontal , the image appear in an upside down orientation. No matter how you install the diagonal mirror, you get an optimal position for observing landscapes, wildlife, and astronomy [Secure & 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 materials with coatings for crisp and images as well as high color fidelity. The 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.