Delta style, titan white intermediate frame 68 x 68 mm for the installation of devices with a cover plate 65 x 65 mm. Delta m-system - design and quality in perfection from Siemens. Our m-system offers various module inserts for signaling and communication purposes. The Siemens m-system provides the following advantages: 1. Due to its modular design, the inserts can be used with Delta line, Delta miro, Delta profil, and Delta style. 2. A module carrier can be equipped with up to two different functions.