***Discontinued per manufacturer. Alternative part number: 7000051817*** 3M™ Flame Resistant Hook Fastener SJ3419FR, Slate Gray, 3/4 in x 50 yd, 16 Roll/Case. 3M™ Flame Resistant Hook Fastener SJ3419FR is one part of a two-part fastener solution designed to provide great durability for thousands of closures. The flame resistant, non-adhesive fastener is most commonly sewn, but can be attached with a variety of hot melt or liquid adhesives. This fastener allows for easy and convenient attachment to a variety of substrates.