The ornamental design for a tool handle head, as shown and described.
FIG. 1 is a perspective view showing the new design for a tool handle head;
FIG. 2 is a left side view thereof, a right side view being a mirror image thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a reduced perspective view showing the tool handle head attached to a cleaning tool.
The broken lines that are adjacent to the surface shading illustrate boundaries that form no part of the claimed design and the broken lines showing a handle in FIGS. 1-4 and 6 and a cleaning tool in FIG. 7 illustrate environmental structure of the tool handle head that forms no part of the claimed design. In addition, the surface shading illustrated in the drawings is provided merely to highlight the contour of design; it is not intended to be illustrative of texture or gloss.