The astronomical telescope eyepiece parfocal rings, are essential accessories for any stargazing enthusiast. These metal rings ensure that your telescope eyepieces remain parfocal, meaning you won't need to when switching between eyepieces. This feature is particularly useful during long observation sessions, allowing for a seamless and uninterrupted viewing experience. Features -Color:Assorted Color -Material:Aluminium alloy -Size:6.00X6.00X0.50cm/2.36X2.36X0.20in -High definition view: the telescope eyepiece parfocal rings provide clear and detailed observation, allowing you to better observe and appreciate the of the universe -Precise focusing: the parfocal ring design ensures more accurate focusing, making it easy to adjust the focal length and obtain clearer images, enhancing your observation experience -Versatile accessory: suitable for various observation needs, meeting your diverse astronomical observation requirements -great and reliable: made from great materials, these rings are great and not easily , providing a stable and reliable observation experience -Wide compatibility: compatible with various telescopes, whether you are an amateur enthusiast or a professional observer, you can enjoy a great observation experience Package list: 4 x parfocal ring 2 x wrench