This hypoallergenic locking earring backs replacement set includes 6 pairs designed to fit about 0.7 to 0.8 mm earring posts for secure stud earring support. Nickel free and lead free metal earring backings are designed for sensitive ears with non irritating material suitable for daily jewelry wear. The secure locking structure provides a firm grip on stud earrings to help prevent earrings from slipping, loosening, or getting lost. Suitable for DIY jewelry repair, stud earring replacement, jewelry making supplies, and everyday earring maintenance. This hypoallergenic locking earring backs replacement set contains 6 pairs designed to fit approximately 0.7 to 0.8 mm earring posts for secure stud earring support. The nickel free and lead free metal material is suitable for sensitive ears and helps provide comfortable daily wear. The locking structure offers a firm grip to help prevent earrings from slipping, loosening, or getting lost. Suitable for DIY jewelry repair, stud earring replacement, jewelry making supplies, and everyday earring maintenance.