Eyepiece Coaxial Lock Adapter - Lightweight and rust-resistant material Made from a lightweight aluminum alloy, this adapter combines light weight with corrosion resistance, making it well suited for outdoor astronomy and travel. - Stable coaxial connection The coaxial quick-lock mechanism provides a secure, stable connection between your eyepiece and telescope, reducing interruptions during observations and improving overall viewing experience. - Safe installation with non-slip gasket An integrated anti-slip gasket ensures a reliable fit, keeping accessories securely in place so you can focus on what you see through the eyepiece. - Adjustable size options Available in three sizes to fit different telescope models with M42/eyepiece drawtubes, ensuring the right fit for your observing setup. Use scenarios - Quick field setup during outdoor observing: easily attach or switch eyepieces and telescopes without losing alignment. - Stable viewing in challenging conditions: the anti-slip gasket maintains a secure fit even when handling or minor vibrations occur. - Multi-scope compatibility: select the correct size to use across various telescopes with M42 drawtubes, enabling seamless use in a single observing session.