Quality Material: Upgraded locking pin backs are made of quality nickel-plated copper, durable and sturdy, they can lock your pins firmly, ensuring that your pins stay secure and in place. Easy to Use: Easily lock and remove pins with the spring-loaded latch design, no tools required, just push the base to lock and secure them, pull to release the lock and remove it. this makes these locking pin backs a great choice for those who frequently wear and swap out pins. Secure Your Pins with Ease: These locking pin backs provide an added layer of security to your pins, ensuring that they stay securely in place. unlike traditional pin backs, these locking pin backs have a unique snap design that prevents keeping your pins from falling off, getting lost. Widely Used: The metal pin backing are suitable for pins, lapel pins, name tags, display books, lanyards, bags, vests, hats, jean button, badge, backpacks, enamel pin and other DIY projects. Value for Money: This product comes in a package of 40, which provides ample locking pin backs, the size of the pins back is 0.4inch diameter, 0.25inch height. they are compatible with most standard pin sizes and stylesto use for all your pin needs.