[High material] The upgraded pin back is made of high- plated copper, which is durable and . buckle design can firmly lock the needle to safety without falling off or losing.[Easy to use] No tools are needed. The spring pin design is easy to lock and remove. Just the base to lock and fix it, and pull to release the lock and remove it. Replace the latch at any time.[Widely used] The metal needle back is suitable for needles, lapel needles, name tags, display books, lanyards, bags, vests, hats, buttons, , enamel needles, , etc.[The ] 30 PCS needle back lock with clear storage box makes storage more convenient. The size of the needle back is 0.4 inch diameter and 0.25 inch height. It is small and easy to use. Better your and your 's decorative needs.Material: Metalcolour: SilverPackage Contents:100 x pin clasps back Only the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.