1.25 inch 90 degree mirror to that the images are upright, but left and right reversed. The diagonal reflector are suitable for viewing celestial-bodies and good for land observation use. Simply insert the erecting prism into the 1.25 inch focuser and enjoy upright and right-angled images with your eyepieces. Comfortable observation with 90-degree: Look pleasantly from above into your eyepiece, filter thread for any 1.25 inch filter and accepts standard 1.25 inch eyepieces. A more comfortable viewing position and clear images. Colour:As Shown Material:Aluminum alloy Adapter eyepiece: 1.25inch Refraction 90-Degree Reflectivity: 90% Applicable to: refractors Size:.14x9x5cm/5.51 inch x 3.54 inch x1.97 inch Due to different batches, there may be differences in product appearance and printed text, which not affect use Package Contents: 1 x Erecting Prism 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.