The ornamental design for a drillingtool, as shown and described.
FIG. 1 is a front view of a first embodiment of a drilling tool showing the new design;
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof; and,
FIG. 4 is a front view of a second embodiment of a drilling tool showing the new design.
The broken lines shown in the drawings are for the purpose of illustrating portions of the drilling tool and form no part of the claimed design. A top view of the second embodiment is omitted because that view is identical to the top view of the first embodiment shown in FIG. 2. A bottom view of the second embodiment is omitted because that view is identical to the bottom view of the first embodiment shown in FIG. 3. A left side view, a right side view, and a rear view of each embodiment are omitted because those views are identical to the front view of each respective embodiment.