What is claimed is the ornamental design for a tool holder, as shown and described.
FIG. 1 is a upper left perspective of a tool holder;
FIG. 2 is a lower right perspective view of the tool holder of FIG. 1;
FIG. 3 is a top plan view of the tool holder of FIG. 1;
FIG. 4 is a bottom plan view of the tool holder of FIG. 1;
FIG. 5 is a left elevational view of the tool holder of FIG. 1;
FIG. 6 is a right elevational view of the tool holder of FIG. 1;
FIG. 7 is a front elevational view of the tool holder of FIG. 1;
FIG. 8 is a rear elevational view of the tool holder of FIG. 1; and,
FIG. 9 is an upper right perspective, environmental view of the tool holder of FIG. 1 holding a tool.
The broken lines showing a tube into which the tool holder is fitted and the broken lines showing a tool inserted into the tool holder are included for the purpose of illustrating an environment of the tool holder and form no part of the claimed design.