Rivet fastening tool

FIG. 1 is a top and rear perspective view of a rivet 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.

Broken lines illustrate portions of the fastener fastening tool and form no part of the claimed design.