Feature: 1. Telescope C Mount Adapter: With a thread size of 25mm, the outer diameter is 31.7mm, can be used for eyepiece converter 31.7mm to C CS CCD interface. 2. Function: The telescope adapter has a diameter of 1.25 inches for insertion in place of a 1.25 inch telescope eyepiece, allows the camera to be put into standard eyepiece holders. 3. Practical: The telescope adapter can adjust eyepiece location, help you to get more sharp image, simple installation and high accuracy in size, it can perfectly fit your astronomical telescope. 4. Durable Material: Made of high strength aluminum alloy material, which has good durability and stability, is not easy to deform, wear, and has a long service life. 5. Wide Application: Support all types of telescopes, reflector, refractor, to observe the star clusters, moon, planets and other celestial bodies. Specification: Item Type: Astronomical Telescope C Mount AdapterMaterial: Aluminum alloy .Thread Size: Approx. 25mm/0.98inOuter Diameter: Approx. 31.7mm / 1.25in Package List: 1 x Telescope C Mount Adapter