Multifunctional fasteners for doors and windows and a variety of installation scenarios. This set includes metal-expansion screws and hook-expansion screws for versatile mounting. Easy installation with an internal expansion design. Simple to use, it streamlines the installation process and makes replacing fastening screws and metal dowels straightforward. Durable construction. Made from iron and copper, these screws are designed for longevity and wear resistance. Suitable as metal screw anchors and metal-expansion screws. Elegant gecko-style window design. Functional and visually suitable for different door and window installations, including wall anchor screws and wall mounting screws. Use scenarios: - Mount window frames, sashes, or door hardware (hinges, handles, weatherstripping) on wood or masonry. - Install wall-mounted fixtures or hooks on masonry walls using wall anchor screws. - Secure brackets or shelves in interior or exterior applications where a reliable expansion screw is required.