3M™ Dual Lock™ Reclosable Fastener SJ4575 Low Profile is a low surface energy adhesive on the back of a black polypropylene reclosable fastener. This product is half the thickness of standard 3M™ Dual Lock™ Reclosable Fasteners, providing a low profile attachment. An alternative to screws and bolts, this hidden fastener provides a snug fit and smooth aesthetic appearance.