3M Dual Lock Low Profile Reclosable Fastener SJ4570, Clear, 1 in x 50 yd, Secure Interlocking Alternative to Screws and Bolts, Smooth Aesthetic, Indoor Use, 2 Rolls 1 in x 50 yd Acrylic adhesive bonds Clear 2 500212004488313M Dual Lock 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 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. SJ4570