The ornamental design for a roundbalusterconnector, as shown and described.
FIG. 1 is a top perspective view of the round baluster connector of the present invention.
FIG. 2 is a bottom perspective view of the round baluster connector depicted in FIG. 1.
FIG. 3 is a top plan view of the round baluster connector depicted in FIG. 1.
FIG. 4 is a bottom plan view of the round baluster connector depicted in FIG. 1; and,
FIG. 5 is a front side plan view of the round baluster connector depicted in FIG. 1, where rear and side plan views of the round baluster connector are identical to the front side plan view.