Black, polypropylene reclosable fastener with rigid backing, rigid backed circle with hole 400 stems per square inch, 13/16 inch diameter 0.8125 in (20.6 mm) diameter washer with 0.16 in (4.1 mm) hole. 3M ™ Dual Lock ™ Reclosable Fasteners have been used extensively in transportation, electronics, business equipment, machinery, medical and sign and display markets. When the mushroom-shaped stems interlock, tensile strength is high enough to repla