The ornamental design for a wristbandattachment, as shown and described.
FIG. 1 is a perspective view of a first embodiment of a wrist band attachment showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
FIG. 8 is another perspective view thereof wherein the end piece of the attachment is in a turned position.
The broken lines illustrating the unclaimed portions of the wrist band attachment form no part of the claimed design. The dot-dash broken lines defining the boundaries of the claimed design form no part of the claimed design.