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.Value for money: This product comes in a package of 30, providing sufficient locking pin backs to meet all your pin back locking needs.We sincerely provide you with good enough products and services. Product Description DECYOOL pin backs locking are made of quality nickel-plated copper, small and sturdy. The metal material makes locking clasp is durable and colorfast, giving you an incredibly sturdy and safe experience. Pin back is suitable for bag,pins,badge,lanyards and a good helper for dressing , which is a good choice for those who frequently wear and swap out pins. These pin keepers are easy to put on and take off without a tool; Simply push to secure onto pin post while holding onto your pin to release. Metal Pin Back for Pins These pin backs are reliable and sturdy , hard to break. Whether you're looking to create your own custom pins and badges, or simply looking to replace lost or worn-out backs,DECYOOL pin backs are the ideal choice.