FIG. 1 is a perspective view of the step stool, incorporating the new design; FIG. 2 is a front elevational view, the rear elevational view being a mirror image; FIG. 3 is a left side elevational view thereof; and FIG. 4 is a right side elevational view thereof, FIG. 5 is a top view of the step stool; and FIG. 6 is a bottom view of the step stool; and, FIG. 7 is an exploded perspective view of the step stool.