Pin backs can be glued onto any surface for an instant broach. We highly recommend using E-6000 Glue for a secure hold. Make sure it is completely dry before wearing. Secure lock mechanism moves smoothly but stays in place once closed. Designed so sharp point of pin will not jut out past lock. Total length is 1 Inch (27 mm). 4.5mm wide and 6mm thick including lock. Quantity: 24 Pieces.