FIG. 1 is a perspective view of a tool arbor embodying the invention.

FIG. 2 is a right side view of the tool arbor shown in FIG. 1, the left side view, top view and bottom view being substantially the same as the right side view.

FIG. 3 is a front view of the tool arbor shown in FIG. 1; and,

FIG. 4 is a rear view of the tool arbor shown in FIG. 1.

The portions of the tool arbor shown in broken lines are for illustrative purposes only and form no part of the claimed design. The portions of the tool arbor shown in broken lines having unequal length segments illustrate the boundary of the claimed design and form no part of the claimed design.