US D574957 S1
I claim the ornamental design for a bone plug, as shown and described.
FIG. 1 is a side elevation of a bone plug showing my new design;
FIG. 2 is a side elevation of the side opposite that shown in FIG. 1;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof; and,
FIG. 5 is a bottom perspective view thereof.