High quality material: The upgraded locking pin is made of high-quality copper, durable and sturdy, designed to securely hold your pin in place. Easy to use: Featuring a spring latch mechanism, these pin backs allow for quick and tool-free attachment and removal. Simply push to lock and pull to release, making them ideal for frequent use. Secure design: The locking mechanism provides added security, helping prevent loss or detachment of your pins. Unlike traditional clutch backs, these feature a reliable buckle-style closure to keep pins firmly in place. Versatile use: Suitable for a variety of applications including lapel pins, name tags, badges, enamel pins, lanyards, bags, hats, vests, backpacks, and other DIY craft projects. Value pack: Includes 40 pin backs. Each measures 0.4 inches in diameter and 0.25 inches in height, compatible with most standard pin sizes and styles. Material: Copper Color: Silver Package Contents: 40 x pin backs Note: Light reflection and display settings may cause slight variations in color. Measurement may vary by +/- 1-3 cm.