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The USA Patented (Patent # US8365369) Lux Lock Earring Backs are the most secure replacement earring backs on the market. Simply slide them onto the post and they easily lock into place with an audible click. The Lux Lock Back fits most push back posts, as well as both single and double notch. Also fits screw back posts (this backing option has to be pushed on as you would for a push back post). Can be used with Friction Back and Screw Back stud Can be used with Friction Back and Screw Back stud (Fits 0.7 mm push back posts and 0.8 mm screw back posts)Its surgical stainless steel mechanism guarantees strength. Available in 14K & 18K White, Yellow and Rose gold.