SMART DESIGN - Lock bracelet and key necklace is 2.2 inches in diameter and fits a small wrist. We recommend that you measure your wrist before buying to avoid it not fitting your wrist. Necklace chain length is 19.8 inches. Romantic matching couple jewelry symbolize that only this key will open up the heart lock bracelet<br> COUPLE SELECTION - Unique design by womens heart lock bracelet with mens key necklace, the couples jewelry is romantic gifts for girlfriend and wife on valentines day, Christmas, birthday, wedding, anniversary. It is a unique and romantic way to express your everlasting love. It means youll always be together forever<br> AMAZING QUALITY - Made of high quality titanium steel, the love heart bracelet with key necklace is laser cutting and polishing technique, anti- rust, nickel free and hypoallergenic for safe, comfortable wear. The heart bracelet has a smooth shining surface, long-time color retention, excellent craftsmanship and top quality, you deserve to own It<br> HOW TO OPEN AND CLOSE - Key necklace and lock bracelet couple bracelets set is very delicate jewelry, so it takes a little skill to open and close. Align the key with the lock core of the bracelet, rotate it 90 clockwise, it is opened; align the sides of the bracelet , fasten it tightly and it will close