We use these snap rivets in cold connection jewelry projects and in leather craft. You'll need a 1/8" hole punch to use these, such as found in the Eurotool Power Punch tool (Contact Us for more info).These rivets measure 5mm in diameter. The post is about 4mm tall. There are 60 sets in a package. These rivets are made of an antique silver plated alloy and were made in East Asia.All photos have been taken indoors with daylight, but as always, computer and mobile screens display colors differently.