Quality Material : These pin backs locking clasps are made of nickel-plated copper,which are durable and sturdy.They can lock your pins firmly to keep them secure . | Multi-function : These mental pin backs are suitable for pins, insignia, name tags, display books, lanyards, bags, vests, hats, badge, collectibles, etc. | Easy to use : The pin back locking is easy on-off action, spring loaded fastener simply need you to push to lock them, then push on the base to secure them ,finally pull to loosen the lock and remove it . | Reasonable Pin Size: The size of the pins back is 0.39in / 1 cm in diameter, 0.24in / 0.6 cm in height.It is convenient to carry. | Satisfaction Guarantee: We sincerely provide you with good enough products and services. If you are not satisfied with the product, please contact us, we will try our best to help you solve it.