Step Stool

FIG. 1 is a perspective view of a step stool;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left elevation view thereof;

FIG. 5 is a right elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The portions of the hidden step shown in broken lines depict environmental subject matter and form no part of the claimed design.