3M™ Dual Lock™ Reclosable Fastener, SJ3541, 1 in x 50 yd (2.5 cm x 45.7 m)

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"Black, interlocking mushroom-shaped heads (400 stem density per square inch) provide strong, reliable, and durable fastening that can be opened and closed multiple times Mates with Type 170 and Type 250 stem densities to provide different strength combinations Synthetic rubber-based adhesive bonds well to a variety of substrates including low surface energy plastics such as polyethylene and polypropylene Strong fastener secures with an audible snap, verifying closure An alternative to screws and bolts, this hidden fastener provides a snug fit and smooth aesthetic appearance"