I claim the ornamental design for a kitchen tool handle, as shown and described.
FIG. 1 is a perspective view of a kitchen tool handle, showing my new design;
FIG. 2 is a top view of the kitchen tool handle;
FIG. 3 is a back view of the kitchen tool handle, the front view being a mirror image;
FIG. 4 is a right side view of the kitchen tool handle; and,
FIG. 5 is a bottom view of the kitchen tool handle.
The broken lines showing an environment for a possible use of the kitchen tool handle in the drawings are for illustrative purposes only and form no part of the claimed design. The left side view is unornamented and not shown.