DELTA i-system titanium white module carrier, 1-way 55x55mm screw fastening Our m-system offers different module inserts for signaling and communication purposes. Thanks to the modular design, all inserts for the DELTA line, DELTA miro, DELTA profil and DELTA style programs can be used with the m-system. A module carrier can be equipped with up to two different functions. DELTA m-system - design and quality in perfection from Siemens.