The ornamental design for a securingstrap for health and safety masks, as shown and described.
FIG. 1 illustrates a perspective view of a securing strap for a health and safety mask according to a first embodiment;
FIG. 2 illustrates a second perspective view of FIG. 1;
FIG. 3 illustrates a top view of the first embodiment of FIG. 1;
FIG. 4 illustrates a bottom view of the first embodiment of FIG. 1;
FIG. 5 illustrates a top view of a second embodiment of a securing strap for health and safety masks; and,
FIG. 6 illustrates a bottom view of the second embodiment of FIG. 5.
The broken lines in the drawings illustrate the environment of the securing strap for health and safety masks, which forms no part of the claimed design.