Flat head pins are used to make loops in jewelry. They are designed so that they can be made into a loop and then inserted into a cord, using the ends as handles. The size of the pin is determined by how big or small it is on its head. Because the flat head pin is shaped like a flat disk, it is more durable than other types of pins. This is due to the fact that there is less surface area for it to bend when pressure is put on the jewelry piece. Even beaded pins are flat head pins that have either a saw tooth edge or a cone shaped end.