FIG. 1 is a left side perspective view of a tool handle cover, 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;

FIG. 7 is a bottom view thereof;

FIG. 8 is a right side perspective view thereof; and,

FIG. 9 is a front view thereof, shown in use with a tool, the broken lines partially showing the tool being included for illustrative purpose only and forming no part of the claimed design.