Lightweight and rust-resistant material Constructed from a lightweight aluminum alloy, this Eyepiece Coaxial Lock Adapter is designed to resist rust, making it well suited for outdoor astronomy. Stable coaxial connection The coaxial quick-lock feature provides a secure and stable connection between your eyepiece and telescope, enhancing your stargazing experience with uninterrupted viewing. Secure installation with non-slip gasket The integrated anti-slip gasket offers a reliable fit, keeping your accessories securely in place so you can focus on your observations. Adjustable size options Available in three sizes, you can choose the right fit for different types of telescopes with M42 threads or eyepiece draw tubes to meet all your observing needs. Use scenarios Backyard and field observing: quickly lock and unlock the eyepiece for efficient changes while maintaining a secure fit. Outdoor travel and adventuring: the rust-resistant aluminum alloy stands up to varying weather and environments. Multi-setup compatibility: three sizes cover telescopes with M42 threads or eyepiece draw tubes, enabling flexible use across different setups.