The ornamental design for a tool handle, as shown and described.
FIG. 1 is a front perspective view of the tool handle of the present invention showing my new design;
FIG. 2 is a front side elevational view thereof;
FIG. 3 is a back side elevational view thereof;
FIG. 4 is a side elevational view thereof;
FIG. 5 is another side elevational view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a top plan view thereof.
The broken line showing of a bit holder is directed to environment and forms no part of the claimed design. All other broken lines in the drawings indicate features of the tool handle that also form no part of the claim.