The ornamental design for a toolholder, as shown and described.
FIG. 1 is a right side perspective view of a tool holder showing my new design, a left side perspective view being a mirror image thereof.
FIG. 2 is a front elevation view thereof, a rear elevation view being identical;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view; and,
FIG. 5 is right side perspective view of the tool holder showing tools secured therein.
The portions of the tool holder presented in broken lines represent unclaimed portions of the tool holder and form no part of the claimed design. The tools depicted in broken lines in FIG. 5 are for illustrative purposes only and form no part of the claimed design.