The ornamental design for a tool handle, as shown and described.
FIG. 1 is a front perspective view of a tool handle showing our new design;
FIG. 2 is a front side view thereof;
FIG. 3 is a back side view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines shown in the drawings show unclaimed environment and portions of the tool handle that form no part of the claimed design. The tool handle is shown with a symbolic break in its length. The appearance of any portion of the tool handle between the break lines forms no part of the claimed design.