The ornamental design for a fastenerfasteningtool, as shown and described.
FIG. 1 is a top and rear perspective view of a fastener fastening tool embodying my new design;
FIG. 2 is a bottom and front perspective view thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a front elevation view thereof;
FIG. 6 is a rear elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines in the drawings illustrate portions of the fastener fastening tool that form no part of the claimed design. The dash-dot broken lines in the drawings define the boundaries of the claim.