Pull The Dot Fastener's One Way Snap Nickel Plated Brass Locking Snap Superior Snap Action 10 Piece Pull The Dot Snap Set, 10 of each Piece - Cap / Socket/ Stud / Post A locking snap assures a firm grip that will remain secure through years of use. Superior snap action and holding strength. These fastener's require a special die for setting properly. Widely used throughout the Law Enforcement, Aviation & Maritime industry for an extreme holding power of the snap under arduous conditions. We can install these fastener's for you or you can take them to your local canvas shop to have them installed.