This unique lock and key design belly button ring has a 316L high grade surgical steel with key hole and a .925 sterling silver key. You have your choice of clear, light blue, dark blue, green, purple, pink, or red colored stones on the keyhole and key. This belly ring is 14 gauge and the length is 10mm-3/8 of an inch. The externally threaded top bead size is 5mm and the bottom is 8mm. Entire piece is nickel free. Size: 14 gauge, Length: 10mm 3/8"