Sheet Fastener

FIG. 1 is a rear, left side and top perspective view of a sheet fastener showing my new design;

FIG. 2 is a front, right side and bottom perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines depict portions of the sheet fastener that form no part of the claimed design.