Light weight & Portable: Designed for easy carrying and installation, this light weight focus aid is perfect for outdoor stargazing without adding extra burden to your setup Premium Aluminum Construction: Made from high strength aluminum alloy, this Bahtinov excellent and oxidation resistance, ensuring long term durability without rust or deformation Precisions Focusing: The Bahtinov structure enables accurate focus, helping users quickly find the optimal observation position for enhanced viewing Sturdy & Smooth Operations: Features a stable Bahtinov grids and smooth sliding rails for vibrations without focusing, ensuring clear observations and effortless adjustments during use Wide Compatibility: Compatibility with various models of astronomical telescopes, this focus plate allows simple replacement and upgrades for different setups