FIG. 1 is a perspective view of a first fastener element, with a unidirectional engaging portion and one relatively narrow side portion.
FIG. 2 is a top view of the fastener element of FIG. 1.
FIG. 3 is a side view of the fastener element of FIG. 1.
FIG. 4 is an end view of the fastener element of FIG. 1.
FIG. 5 is a perspective view of a second fastener element, with a unidirectional engaging portion and one relatively wide side portion.
FIG. 6 is a top view of the fastener element of FIG. 5.
FIG. 7 is a side view of the fastener element of FIG. 5.
FIG. 8 is an end view of the fastener element of FIG. 5.
FIG. 9 is a perspective view of a third fastener element, with a unidirectional engaging portion and two relatively narrow side portions.
FIG. 10 is a top view of the fastener element of FIG. 9.
FIG. 11 is a side view of the fastener element of FIG. 9.
FIG. 12 is an end view of the fastener element of FIG. 9.
FIG. 13 is a perspective view of a fourth fastener element, with a unidirectional engaging portion and two relatively wide side portions.
FIG. 14 is a top view of the fastener element of FIG. 13.
FIG. 15 is a side view of the fastener element of FIG. 13; and,
FIG. 16 is an end view of the fastener element of FIG. 13.