The ornamental design for piece designed for a sectionalwedge, as shown and described.
FIG. 1 is a perspective view of a piece designed for a sectional wedge of the present invention, illustrating a couch in phantom outline, the broken lines showing the couch for illustrative purposes only and forming no part of the claimed design;
FIG. 2 is a rear elevational view of the invention;
FIG. 3 is a front elevational view of the invention;
FIG. 4 is a left-side elevational view of the invention, the right-side elevational view being a mirror image thereof;