3M™ Dual Lock™ Reclosable Fastener SJ3551CF, Black, 1 in x 50 yd, Type 400, 2 Roll/Case. 3M™ Dual Lock™ Reclosable Fastener SJ3551CF is the convenient alternative to traditional fastening methods, such as screws, nuts or bolts. It is designed to deliver a durable, reclosable fastening solution which bonds to a variety of substrates including metals, glass and plastics such as acrylics, polycarbonate and ABS. This fastener gives the adhesive a black appearance.