The ornamental design for a tool handle, as shown and described.
FIG. 1 is a perspective view of my tool handle;
FIG. 2 is a side view thereof;
FIG. 3 is another side view thereof, opposite the side view shown in FIG. 9;
FIG. 4 is a front view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a top view thereof.
The dashed lines outside of the claimed tool handle represent environmental structure that forms no part of the claimed design; specifically, some such dashed lines show aspects of an example tool (a screwdriver) with which the claimed tool handle may be used. Other dashed lines show that while a logo may (but need not) be used with the claimed design, no particular logo is claimed.