Gold-Toned Locking Earring Backs. Pack of 2 Pairs.Made of 24K gold-plated surgical stainless steel, our Locking Earring Backs fit 99% of all earring posts (0.5 – 1.0mm). They’re easy to use: just slide on posts and they lock automatically; one squeeze and they pull right off..Wear them with all your gold pierced earrings and multiple piercings to keep your jewelry investment safe and secure.