3M(TM) Dual Lock(TM) Reclosable Fastener SJ4570 Low Profile is a low surface energy adhesive on the back of a clear polypropylene reclosable fastener. This product is half the thickness of standard 3M(TM) Dual Lock(TM) Reclosable Fasteners, providing a low profile attachment. An alternative to screws and bolts, this hidden fastener provides a snug fit and smooth aesthetic appearance.