[High Quality Material] The upgraded locking pin back is made of high-quality nickel-plated copper, which is durable. The buckle design securely locks the needle in place, preventing it from falling off or getting lost. [Easy to Use] No tools required. The spring pin design allows for easy locking and removal. Simply push the base to lock and secure, and pull to release and remove. Replace the latch at any time as needed. [Widely Used] The metal needle back is suitable for use with lapel pins, name tags, display books, lanyards, bags, vests, hats, buttons, badges, enamel pins, and more. [Convenient Storage] 100-piece pin clasp back locking set with a clear storage box for easy organization. The pin back measures 0.4 inch in diameter and 0.25 inch in height. Compact and easy to use, ideal for meeting your decorative needs. Material: Metal Color: Silver Package Contents: 100 x Pin Clasps Back Locking Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.