This is the perfect replacement backs for your lost or missing pin backs. These are military butterfly clutch pin backs. These also come with nails so that you could use these for your own custom pins or jewelry. All this is required is a solder gun or a glue gun to attach to your own custom crafts. Many people attach to coins or other materials to make great brooches and lapel pins. Shipped in bubble envelope via USPS First Class Mail. Email me with further questions before purchasing.