FIG. 1 is a top view of a bar tool; FIG. 2 is a right side elevation view of the bar tool of FIG. 1; FIG. 3 is a left side elevation view of the bar tool of FIG. 1; FIG. 4 is a bottom view of the bar tool of FIG. 1; and, FIG. 5 is a perspective view of the bar tool of FIG. 1. The broken lines illustrate environmental structure and form no part of the claimed design.