The ornamental design for an extrusion for frames, as shown and described.
FIG. 1 is a perspective view of an extrusion for frames showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a side elevation view thereof;
FIG. 5 is an opposite side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The extrusion for frames is shown with a symbolic break in its length. The appearance of any portion of the extrusion for frames between the break lines forms no part of the claimed design.