A toggle clasp is a type of jewelry fastener commonly used in necklaces and bracelets. It consists of two main parts: a bar and a loop. The bar is inserted through the loop and then turned to secure the clasp, making it easy to open and close. Toggle clasps are popular for their simplicity and effectiveness. They come in various materials, such as metal and plastic, and can be found in different designs to match various styles of jewelry. Their ease of use makes them a favorite among both jewelry makers and wearers.