We claim the ornamental design for a set of pet ramps 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 pet ramp and the central pier of our design, shown exploded for clarity of disclosure and in a second configuration of use, the other pet ramp of the set being identical to the one illustrated;
FIG. 3 is a side and front perspective view of one pet ramp of our design;
FIG. 4 is a top plan view of the set of pet ramps and central pier shown in FIG. 1;
FIG. 5 is a left side elevation view thereof, a right side elevation view thereof being a mirror image of the left side elevation view;
FIG. 6 is a front elevation view thereof;
FIG. 7 is a rear elevation view of the central pier of our design;
FIG. 8 is a top front perspective detail view of FIG. 2, shown enlarged for clarity of disclosure; and,
FIG. 9 is a top front perspective detail view of FIG. 3, shown enlarged for clarity of disclosure.
The bottoms of the pier and of the ramps are unadorned and form no portion of the claimed design.