Two titanium-lacquered pushbuttons with ring illumination are combined in one housing, requiring only one contact unit and one mounting hole – provide either one oval borehole or a combination of three overlapping 22 mm round holes. Using a suitable washer, allows the actuator to be mounted also in a 16 mm hole. The lenses are suitable for laser printing. The double pushbutton has a two-part plunger, thus, can only be combined with contact units being equipped with two-part plungers as e.g. the BZ type series or some of the CT/CZT contact units (ref. CT2, CTL2, CZTP2, CZTLP2).