The ornamental design for a hubcaptool, as shown and described.
FIG. 1 is a rear perspective view of a hubcap tool showing the new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is bottom view thereof;
FIG. 8 is a right side view thereof showing the design disassembled; and,
FIG. 9 is a perspective view of the hubcap tool in the context in which it is intended to be used, the dashed line structure being provided for purposes of environment and forming no part of the claimed design.