3M™ Dual Lock™ Reclosable Fastener SJ3542 is the easy and clear alternative to traditional fastening methods, such as screws, nuts or bolts. It is designed to deliver a durable, reclosable fastening solution (which can be opened and closed multiple times) which bonds to a variety of substrates including many plastics and low surface energy materials. - Designed to bond to many plastics, powder coated paints and other low surface energy materials. Type 170 stem density polyolefin fastener which mates to type 250 or 400.