Asscher 4-Prong Safety Locking Stud Earring MountingThis positive locking clutch grips the double notched post securely and has a dual tab release for easy on and off. Pair of asscher shape 4 prong basket stud earrings mounting setting are precisely crafted with metal mold for finer finish with Protektor safety post and locking back. These high quality semi polished settings are intended for faceted gemstones, require notches to be cut according to your gemstone with the proper tools and skills to set