There are three main types of fastenings when it comes to stud earrings, with the most traditional being the butterfly back. However, andralok earrings and screw back fastenings have their advantages too. | Andralok | Butterfly Back | Screw Back | Andralok The andralok style is a modern earring fastening, with andralok studs becoming increasingly popular. They remove the need to worry about fiddly butterfly …