The ornamental design for a handle for tools, as shown and described.
FIG. 1 is a perspective view of a handle for tools showing my design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines shown in the drawing illustrate portions of the handle for tools in which the design is embodied that forms no part of the claimed design.