For the attachment of facade and roof substructures, light wells, and more, the Fassad XL features a double-split expansion body with a rotational locking mechanism. It is supplied as a fastening set with screws and has the approval of the building supervisory authority. The design ensures optimal force distribution through the double expansion mechanism. The rotational locking guarantees secure installation, while the collar allows for thermal separation and prevents contact corrosion. It includes a SW 17 wrench with a TX50 internal drive for narrow components, as well as attached washers for optimal force transmission. The galvanized screw is suitable for outdoor use, in industrial atmospheres, and in coastal areas with an appropriate protective coating. Installation is carried out using a through-hole method.