The International 1800 Series Surface Mount Closer Sex Nuts are designed for mounting surface closers on doors up to 1-3/4" thick. This 4-pack set is compatible with all sizes of International Series 1800 and 1800-BC door closers. These sex nuts provide a mounting solution for storefront door hardware applications. The set features a storefront bronze finish. Sex nuts, also known as barrel nuts, are used to provide a through-bolt connection for door hardware, preventing the fastener from pulling through the door material. This set is engineered for use with the International 1800 series, ensuring alignment and structural support for the door closer mechanism. The components are intended for use on doors where standard screw mounting is insufficient or where the door material requires a through-bolt approach for stability. The storefront bronze finish provides a consistent appearance when installed on matching commercial door hardware. Each pack contains 4 sex nuts, which is the quantity required for the installation of a single surface-mounted door closer unit. These components are compatible with door closer sizes 4 and 5, allowing for application across different door weights and sizes within the specified series. The installation of these sex nuts requires drilling through the door to accommodate the bolt and nut assembly, providing a firm anchor point for the closer body and arm bracket.