The ornamental design for a lifttool, as shown and described.
FIG. 1 is a top view of the lift tool in an extended position and embodying the new design;
FIG. 2 is a bottom view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is an enlarged front view thereof;
FIG. 6 is an enlarged rear view thereof;
FIG. 7 is a top perspective view thereof; and,
FIG. 8 is a perspective of the lift tool in a folded position.
FIGS. 1–8 show attachment portions at the ends of the lift tool and five sets of bolts and nuts in broken lines, the portions shown in broken lines form no part of the claimed design.