3M Multi-Purpose Reclosable Fasteners create a secure and simple way to install components and materials such as interior trim panels in vehicles. These fasteners create an attachment when the hundreds of mushroom-shaped stems interlock as the two sides are pressed together. A "snap" sound indicates that the fastener is fully engaged.3M Multi-Purpose Reclosable Fasteners create a secure and simple way to install components and materials such as interior trim panels in vehicles. These fasteners create an attachment when the hundreds of mushroom-shaped stems interlock as the two sides are pressed together. A "snap" sound indicates that the fastener is fully engaged.