The ornamental design for wire insulation stripping tool, as shown and described.
FIG. 1 is a perspective view of wire insulation stripping tool;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof; and,
FIG. 5 is a bottom view thereof.
The portion shown by broken lines is for illustrative purposes only and forms no part of the claimed design. The dashed lines show a borderline between the claimed design and other portion.