We claim the ornamental design for a knife handle, as shown and described.
FIG. 1 is a top, front, and right side perspective view of a knife handle showing the claimed design;
FIG. 2 is a right side view of the design of the knife handle shown in FIG. 1;
FIG. 3 is a left side view of the design of the knife handle shown in FIG. 1;
FIG. 4 is a top view of the design of the knife handle shown in FIG. 1 with the front of the handle shown at the bottom of the figure and the back of the handle shown at the top of the figure;
FIG. 5 is a bottom view of the design of the knife handle shown in FIG. 1 with the front of the handle shown at the bottom of the figure and the back of the handle shown at the top of the figure;
FIG. 6 is a rear side view of the design of the knife handle shown in FIG. 1; and,
FIG. 7 is a front side view of the design of the knife handle shown in FIG. 1.
The broken lines in the drawings illustrate blades that form no part of the claimed design.