The ornamental design for an impactwrench, as shown and described.
FIG. 1 is a front perspective view of an impact wrench in accordance with our new design;
FIG. 2 is a rear perspective view of the impact wrench in accordance with our new design;
FIG. 3 is a front elevational view of the impact wrench in accordance with our new design;
FIG. 4 is a rear elevational view of the impact wrench in accordance with our new design;
FIG. 5 is a top plan view of the impact wrench in accordance with our new design;
FIG. 6 is a bottom plan view of the impact wrench in accordance with our new design;
FIG. 7 is a right side elevational view of the impact wrench in accordance with our new design;
FIG. 8 is a left side elevational view of the impact wrench in accordance with our new design; and,
FIG. 9 is a front perspective view of the impact wrench in accordance with our new design illustrating a state in which a battery is attached to the impact wrench.
The broken lines in the drawings illustrate portions of the impact wrench or an environmental structure (i.e., the battery shown in FIG. 9) that form no part of the claimed design.