FIG. 1 is a front perspective view of a pen tool showing my new design according to a first embodiment;
FIG. 2 is a top plan view thereof;
FIG. 3 is a cross-sectional view taken along the line 3-3 in FIG. 2;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is both a front and rear elevation view thereof;
FIG. 6 is both a left and right elevation view thereof;
FIG. 7 is an enlarged view of the portion 7 encircled in FIG. 1;
FIG. 8 is a front perspective view of a pen tool showing my new design according to a second embodiment;
FIG. 9 is a top plan view thereof;
FIG. 10 is a cross-sectional view taken along the line 10-10 in FIG. 9;
FIG. 11 is a bottom plan view thereof;
FIG. 12 is both a front and rear elevation view thereof;
FIG. 13 is both a left and right elevation view thereof; and,
FIG. 14 is an enlarged view of the portion 14 encircled in FIG. 8.
The evenly dashed broken lines in the drawings illustrate portions of the pen tool that form no part of the claimed design. The dotted broken lines in the drawings encircle portions of the claimed design that are illustrated in enlargements and form no part of the claimed design. The dot-dash broken lines in FIGS. 1, 3, and 7 represent a boundary line that forms no part of the claimed design.