The 5-pack Xssive Universal Metal Plate Holder XSS-MT1 appears to be a product used for magnetic phone holders in cars.
These metal plates are usually placed between your phone and its case or attached directly to the back of your phone, allowing it to be securely attached to a magnetic holder in your vehicle. These metal plates are generally universal in size and shape, making them compatible with a range of magnetic phone holders. They are particularly useful for people who want a convenient and hands-free way to attach their phones while driving for navigation, hands-free calling or media playback.
Please note that specific features and compatibility of this product may occur, so it is always a good idea to check the product description or contact the manufacturer or seller for more detailed information.