The ornamental design for a metalfinishingrotarytool, as shown and described.
FIG. 1 is a front perspective view of a metal finishing rotary tool showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken line showing of portions of the metal finishing rotary tool in FIGS. 1-7 is for the purpose of illustrating environmental structure and forms no part of the claimed design.