Enjoy earrings worry-free with Lox's patented technology. The unique secure earring back design grips posts from 0.5mm - 1mm in diameter. It's perfect for precious and costume metal earrings, especially top heavy and statement styles. With a gold tone stainless steel clip and hypo-allergenic plastic body, each back measures 7mm in diameter and 3.4mm in depth. Comes in a pack of 4.