I claim the ornamental design for a grip for a derma blade, as shown and described.
FIG. 1 is an isometric front view of a grip for a derma blade;
FIG. 2 is a front view of the grip of FIG. 1;
FIG. 3 is a rear view of the grip of FIG. 1;
FIG. 4 is a left side view of the grip of FIG. 1;
FIG. 5 is a right side view of the grip of FIG. 1;
FIG. 6 is a top view of the grip of FIG. 1;
FIG. 7 is a bottom view of the grip of FIG. 1;
FIG. 8 is an isometric rear view of the grip of FIG. 1; and,
FIG. 9 is a perspective view of the grip of FIG. 1 shown with the derma blade.
The broken lines shown in FIGS. 1-5, 7 and 8 illustrate portions of the grip for derma blade that form no part of the claimed design. The remaining broken lines shown in FIG. 9 illustrate environment and form no part of the claimed design.