[High quality material] The upgraded locking pin back is made of high-quality nickel plated copper, which is durable and firm. The unique buckle design can firmly lock the needle to ensure its safety without falling off or losing. [Easy to use] No tools are needed. The spring pin design is easy to lock and remove. Just push 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, cowboy buttons, badges, enamel needles, DIY crafts, etc. [The best choice] 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 meet your and your family's decorative needs. Material: Metal colour: Silver Package Contents: 100 x pin clasps back locking Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!