Snap & Set Earring 4mm Round 4 Prong Sterling Silver (1 Earring Only) Snap and Set Earrings are easy to use "self setting" mountings. Just place your Stone face down on a wood or hard rubber surface, and press the Earring straight down. When you hear the "snap", your Earring is ready to wear! Snap and Set works great on Natural Stones and Cubic Zirconia, but is not recommended for use with Swarovski Stones. Size: Fits 4mm Stones * If you want a pair please order accordingly