Jewelry Bails - Jewelry Bails come in a variety of sizes and styles. The snap on necklace bail is one of the most familiar and popular. There are a number of sizes to choose from to fit your needs. They simply clip onto the ring or loop of a pendent then over your necklace chain. Other types of bails include the triangle bail and pinch or prong bail. Both of these styles are most often used to hang things like drilled stones and Austrian crystals. Base metal bails are usually brass or steel with a gold or silver tone finish.