3 Pairs Brass Secure Screw on Earring Backs Replacement for Threaded Post Diamond Earring Studs Screwbacks Locking Backs Feature: SILVER &18K GOLD PLATED BRASS EARRINGS BACKS3 Pairs/6pcs White & Gold Color Screw Earring Backs Replacements Screw Earring Backs use Real 925 Sterling Silver Materials and 18K White Gold Plated, Nickel Free, Lead Free, Non-irritating for Sensitive Ears, Hypoallergenic. Keeping Screw Backs Duarable & Shinning Forever.SCREW BACKS SIZE & EASY TO USEApprox 0.24x0.24inches, Fit 0.031'' Threaded Post Size. Perfect Size to Hold it ,twist front to the right to Wear on and Turn Left to Unscrew. Note: Only usable for Screw Post.The Screw Earring Backs is Security, Convenience and Comfort. This Special ScrewBacks Design Allows You Use It on Your Gorgerous Diamond and Pearl Stud Earrings Safely and Enjoy All The Date and Party.Item Type :Earring BacksDesigns:ScrewBacksMaterial:Brass(Nickel Free, Hypoallergenic property)Color:Silver,Gold,Type: A/B(Optional)Size:More detailed,please see photo.Quantity:3 Pairs/6pcs . Note:Size for manual measurement, there may be a 0 to 3mm error, belongs to the normal phenomenon.And due to the difference between different monitors, the picture may not reflect the actual color of the item.Thank you Package includes:3 Pairs/6pcs x Earring Backs.