Shackle

FIG. 1 is a perspective view from above, to the front and to the left side of a first embodiment of a shackle showing the claimed design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a perspective view from above, to the front and to the left side of a second embodiment of a shackle showing the claimed design;

FIG. 9 is a front elevation view thereof;

FIG. 10 is a rear elevation view thereof;

FIG. 11 is a left side elevation view thereof;

FIG. 12 is a right side elevation view thereof;

FIG. 13 is a top plan view thereof; and,

FIG. 14 is a bottom view thereof.

In the drawings, the evenly spaced broken lines depict portions of the shackle that form no part of the claimed design.