This complete set of replacement screws and bolts is designed for the iPad Pro 12.9-inch 2017 models (A1670, A1671, A1821). If you're undertaking a repair on your device, this screw kit ensures you have all the necessary fasteners to complete the job, replacing any lost or stripped screws. Each set has been inspected to ensure it meets quality standards before shipping. Professional installation is recommended for all mobile device repairs. We cannot be held responsible for any damage to your tablet that may occur during the installation of replacement components.