1. Free Magnification: The macro extension tube with autofocus is equipped with 12mm and 24mm tubes, which can be used alone or connected together to achieve different magnifications through various combinations. 2. Pure Copper Contact: The metal contacts are made of pure copper, which not only ensures no degradation of image quality when entering the lens but also supports autofocus and auto-exposure functions. 3. Robust and Durable: The shell is made of aluminum alloy, making it lighter and offering better protection. The front and rear protective caps effectively protect the lens from wear. 4. Macro Photography: With a lens adapter, your Nikon camera can use a regular lens to meet your needs for shooting macro objects without requiring a dedicated macro lens. 5. Z Mount: The Z mount is designed in a 1:1 ratio according to Nikon cameras and supports models like Z5, Z6, Z7, Z50, Z62, Z72. Installation is smooth and snag-free.