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. - 3M Dual Lock low profile reclosable fastener is thinner allowing it to be more flexible than similar reclosable fasteners. The Dual Lock low profile reclosable fastener SJ4570 is a clear fastener offering transparent properties to allow color and patterns to visibly show through giving the fastener an almost invisible appearance. The Dual Lock low profile reclosable fastener SJ4575 is black in color and gives a definite presence for when you want to see your fastener or have it blend in with a dark background