The ornamental design for a wrench, as shown and described.
FIG. 1 is a perspective view of a wrench showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The dash-dash broken lines of FIGS. 1-7 are included for the purpose of illustrating portions of a wrench and form no part of the claimed design. The dot-dash broken lines define the bounds of the claimed design and form no part thereof.