I claim the ornamental design for a magnetic tool holder, as shown and described.
FIG. 1 is a front elevation view of the magnetic tool holder showing my new design;
FIG. 2 is a rear elevation view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a perspective view thereof; and,
FIG. 8 is a perspective view thereof showing a typical use; where the magnetic tool holder is clipped to the belt of a user and is ready to receive a tape measure.
The broken lines depicting a tape measure and user in FIG. 8 are for illustrative purposes only and form no part of the claimed design.