FIG. 1 is plan view of a tool hub showing our new design;

FIG. 2 is a front view of the tool hub of FIG. 1, the rear view being a mirror image of the same;

FIG. 3 is a left side view of the tool hub of FIG. 1;

FIG. 4 is a plan view of a tool hub showing a modified embodiment of the design shown in FIGS. 1-3;

FIG. 5 is a front view of the tool hub of FIG. 4, the rear view being a mirror image of the same;

FIG. 6 is a left side view of the tool hub of FIG. 4;

FIG. 7 is a plan view showing a second modified embodiment of the design shown in FIGS. 1-3.

FIG. 8 is a front view of the tool hub of FIG. 7, the rear view being a mirror image of the same; and,

FIG. 9 is a left side view of the tool hub of FIG. 7.

The broken lines which define the bounds of the claimed design form no part thereof.