3M Dual Lock Reclosable Fastener SJ3550

•Black, interlocking mushroom-shaped heads (250 stem density per square inch) provide strong, reliable and durable fastening that can be opened and closed multiple times •Mates with Type 170, Type 250 or Type 400 stem densities to provide different strength combinations •White, acrylic, conformable foam tape bonds well to a variety of substrates including metals and plastics such as acrylics, polycarbonate and ABS