The ornamental design for a set of petramps and central pier, as shown and described.
FIG. 1 is a top, front perspective view of a set of pet ramps and central pier, showing our new design in a first configuration of use;
FIG. 2 is a top, front perspective view of one ramp and the central pier as shown in FIG. 1, shown in a second configuration of use and exploded for clarity of disclosure;
FIG. 3 is a bottom, side perspective view of the ramp depicted in FIG. 2;
FIG. 4 is a top plan view of the set of pet ramps and central pier of FIG. 1;
FIG. 5 is a left side elevation view thereof, a right side elevation view being a mirror image of the left side elevation view;
FIG. 6 is a front elevation view thereof;
FIG. 7 is an enlarged view of detail “7” identified in FIG. 2;
FIG. 8 is an enlarged view of detail “8” identified in FIG. 3; and,
FIG. 9 is an enlarged view of detail “9” identified in FIG. 1.
Bottom and interior surfaces of the pier are unadorned and form no portion of our design. The bottoms of the ramps are unadorned and form no portion of our design.