What is claimed is the ornamental design for a ratchet wrench, as shown and described.
FIG. 1 is a right side elevational view of a ratchet wrench showing the new design;
FIG. 2 is a left side elevational view thereof;
FIG. 3 is a rear side elevational view thereof;
FIG. 4 is a front side elevational view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a perspective view thereof.
Any elements shown in dashed lines are provided for illustrative purposes only and form no part of the design claimed. Any surface shading is used solely to show the character or contour of the surfaces represented.