FIG. 1 is a left perspective view of a sledge hammer head, showing my new design;

FIG. 2 is a right perspective view thereof;

FIG. 3 is a front elevational view thereof, the rear elevational view being a mirror image of the front elevational view;

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 left perspective view thereof, shown in assembly with a handle, wherein the handle is shown in broken lines for illustrative purposes only and forms no part of the claimed design.