Fastener

FIG. 1 is an isometric view of a front, top, and right side of an ornamental design for a fastener;

FIG. 2 is an isometric view of a front, bottom, and right side of the fastener of FIG. 1 ;

FIG. 3 is a front elevational view of the fastener of FIG. 1 ;

FIG. 4 is a rear elevational view of the fastener of FIG. 1 ;

FIG. 5 is a right side elevational view of the fastener of FIG. 1 ;

FIG. 6 is a left side elevational view of the fastener of FIG. 1 ;

FIG. 7 is a top plan view of the fastener of FIG. 1 ; and,

FIG. 8 is a bottom plan view of the fastener of FIG. 1 .

The dashed broken lines in the drawings illustrate portions of the fastener and form no part of the claimed design. The dot-dash-dot broken lines in the drawings define the bounds of the claim and form no part thereof.