The Metal Cap & Chain for ST Mating Sleeve/ST Adapter is designed to provide reliable protection for unused ST fiber optic adapters or mating sleeves. Made from durable metal, this dust cap prevents contamination, dust, and mechanical damage to the adapter’s internal components, ensuring optimal performance and longevity. Equipped with a sturdy chain, the cap can be securely attached to panels or equipment, reducing the risk of loss and ensuring convenient access when needed. Ideal for laboratory setups, network cabinets, and industrial applications, this protective cap helps maintain clean fiber connections and stable signal transmission.