Lox | Silver Tone Secure Earring backs | LOX2SE Why Lox? Hypoallergenic - Lox has a Hypoallergenic plastic body. It is only the Lox that contacts your skin. Patented design - Designed and manufactured in the UK, Lox's unique earring back technology makes it the only product of its kind Fits 99% earrings- Lox automatically adjusts to post diameters 0.5mm-1.0mm and lock at any depth. Lox fit studs, screw backs and swan necks. Easy to use- Simply slid on to secure then squeeze metal clip to release Strong and secure- Lox can easily lift a 5lb weight and grips tighter if earrings is pulled Durable long life- Nickle release-tested stainless steel clip for durable long life. Lifetime guarantee- Lox has been tested to simulate 50 years of daily use, which is why it carries a lifetime guarantee. Each pack includes 2 pairs of Secure Earring Backs.