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.