The International 1800 Series Surface Mount Closer Sex Nuts are designed for mounting surface closers on doors up to 1-3/4" thick. This set includes 4 sex nuts, providing the necessary hardware for installation. These sex nuts are compatible with all sizes of International Series 1800 and 1800-BC door closers. The aluminum finish provides a neutral appearance suitable for various door hardware applications. This set is intended for use with door closer sizes 4 and 5. These sex nuts are essential components for the proper attachment of surface mounted door closers to doors, ensuring that the closer is held firmly in place during operation. The 4 pack configuration provides enough hardware for a single door closer installation. These components are specifically engineered for the International 1800 series, maintaining compatibility with the existing door closer hardware ecosystem. The aluminum construction is suitable for standard interior and exterior door environments where surface mounted closers are utilized.