Fastening Device

FIG. 1 is a top perspective view of a first embodiment of a fastening device. FIG. 2 is a bottom perspective view thereof. FIG. 3 is a top view thereof. FIG. 4 is a left elevation view thereof. FIG. 5 is a right elevation view thereof. FIG. 6 is a bottom view thereof. FIG. 7 is a front elevation view thereof; and, FIG. 8 is a back elevation view thereof. The broken lines in the drawings illustrate portions of the article that form no part of the claimed design and are included for environmental purposes only. The dash-dot-dash lines represent boundaries of the claimed design and form no part of the claimed design.