FIG. 1 is a perspective view of the wrench of the present invention showing my new design; FIG. 2 is a front side elevational view thereof; FIG. 3 is back side elevational view thereof; FIG. 4 is a side elevational view thereof; FIG. 5 is a another side elevational view thereof; FIG. 6 is a top plan view thereof; and, FIG. 7 is a bottom plan view thereof. The broken lines depict portions of the wrench that form no part of the claimed design.