The ornamental design for a back design for irongolf club heads, as shown and described.
FIG. 1 illustrates an angled, perspective view of a new design of an iron golf club head depicting multiple cavities formed in a rear face of the golf club head;
FIG. 2 illustrates a rear view of the design shown in FIG. 1 depicting multiple cavities formed in a rear face of the golf club head;
FIG. 3 illustrates a top perspective view of the design shown in FIG. 1 depicting multiple cavities formed in a rear face of the golf club head;
FIG. 4 illustrates an angled bottom-perspective view of the design shown in FIG. 1 depicting multiple cavities formed in a rear face of the golf club head;
FIG. 5 illustrates an angled perspective view of the design shown in FIG. 1 taken from the heel depicting multiple cavities formed in a rear face of the golf club head;
FIG. 6 illustrates an angled perspective view of the design shown in FIG. 1 taken from the toe depicting multiple cavities formed in a rear face of the golf club head;
FIG. 7 illustrates a side view of the design shown in FIG. 1 taken from the top perimeter edge of the club depicting multiple cavities formed in a rear face of the golf club head;
FIG. 8 illustrates an angular perspective view of the design shown in FIG. 1 taken from the bottom perimeter edge of the club depicting multiple cavities formed in a rear face of the golf club head; and,
FIG. 9 illustrates a rear image of the club of the design shown in FIG. 1 taken from the heel depicting multiple cavities formed in a rear face of the golf club head.
The broken, dashed lines shown in the various figures depicting embodiments of the invention are included for the purpose of illustrating environment and do not form any part of the claimed design.