Features: Ensure your pins stay secure with the pin keepers, featuring locking pin backs and wrenches, designed to prevent accidental loss and provide a reliable hold for all your pins. Crafted from copper, these pin backs are rusts resistant, and offer a low profile finish that eliminates finger stabbing and unsightly protrusions. Suit for pin collectors and enthusiasts, these pin keepers are perfect for anyone who wants to protect their valuable pins, or any other collectible pin post items. Use these versatile pin locks on lanyards, bags, vests, hats, and more, ensuring your pins remain securely attached in any setting, whether at work, event, or during travel. With an easy to use designs, simply attach the pin back and tighten with the included wrench, saving you time and effort while providing peace of mind that your pins are safe and sound. Specifications: Materials:Copper Size:Approx.9x6mm/0.35x0.23inch,6x5mm/0.23x0.19inch Weight:80g Color:Silver Package Includes: 20pcs 9x6mmPin Locks+20pcs 6x5mmPin Locks+4pcs Wrenches note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color about the item.