I claim the ornamental design for a massage tool, as shown and described.
FIG. 1 is a front perspective view of a massage tool;
FIG. 2 is a front elevation view of the massage tool of FIG. 1;
FIG. 3 is a front elevation view of an alternate embodiment of the massage tool of FIG. 1;
FIG. 4 is a rear elevation view of the massage tool of FIG. 1;
FIG. 5 is a top plan view of the massage tool of FIG. 1;
FIG. 6 is a bottom plan view of the massage tool of FIG. 1;
FIG. 7 is a left side elevation view of the massage tool of FIG. 1; and,
FIG. 8 is a right side elevation view of the massage tool of FIG. 1.
The broken lines depict portions of the design that form no part of the claim. Shade lines depict contouring and not surface ornamentation. FIG. 2 shows an embodiment of the massage tool of FIG. 1, in which a center opening is provided in dashed lines. In one embodiment, the shape of the center opening is provided as shown in FIG. 3.