FIG. 1 is a right front perspective view of an impact driver showing a first embodiment of my new design.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a right side view thereof.

FIG. 5 is a left side view thereof.

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines and the areas within the broken lines form no part of the claimed ornamental design.