【Filter Holder】The features a dual-wheel design that holds up to 6 or 12 standard 1-inch (25mm) optical filters, allowing quick and precise switching between filters for multi-step optical experiments 【Aluminum Alloy Construction】Crafted from high-quality aluminum alloy with high rigidity and stability, supports long-term stable use in labs 【SM1 (1.035"-40) Thread Compatibility】Each filter port uses a standard SM1 (1.035"-40) internal thread, compatible with 1-inch or 25mm filters up to 4mm thick. It works seamlessly with other SM1 threaded optical components 【User-Friendly Design】The filter wheel is engraved with position numbers (1-6) for quick identification, and the smooth rotating mechanism allows easy filter selection. The base features an M6 threaded hole and 19mm adjustment slot for versatile mounting 【Versatile】Ideal for spectroscopy, imaging experiments, and other optical research applications. It provides a compact, organized way to manage multiple filters in a single setup