This set contains 2 pairs 4 pcs of screw on earring backs sized for 20 gauge threaded posts measuring 0.8 mm 0.032 inch, designed exclusively for screw post earrings. Made from hypoallergenic, nickel free, and lead free metal that is non irritating, durable, and suitable for sensitive ears. The secure screw back design twists on to hold diamond or pearl stud earrings firmly in place for daily wear and special occasions. Easy to use by turning right to fasten and left to remove, providing comfort, safety, and dependable replacement earring backs. This set includes 2 pairs 4 pieces of screw on earring backs designed for 20 gauge threaded posts measuring 0.8 mm 0.032 inch and intended for screw post earrings only. Made from hypoallergenic, nickel free, and lead free metal, the backs are non irritating, durable, and suitable for sensitive ears. The secure screw design helps keep diamond or pearl stud earrings firmly in place for daily wear or special occasions. Easy to attach by turning right and remove by turning left, these backs provide a comfortable and reliable replacement solution.