The ornamental design for a wrenchhead, as shown and described.
FIG. 1 is a top plan view of a wrench head showing my new design;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a right side elevational view thereof; and,
FIG. 4 is an enlarged perspective view taken from the bottom, front and
left side, the perspective view taken from the bottom, rear and left side
being identical.
The broken line showing in FIGS. 1-4 is for illustrative purposes only and
forms no part of the claimed design.