WildKlass Jewelry Skull Safety Pin Taper 316L Surgical Steel (Sold Individually) Buffed and polished to a mirror finish, it works just like a safety pin. It is light weight, secures nicely, easy to hook and unhook with hands. Material : 316L Surgical Steel Thickness : 16GA / 1.2mm | 18GA / 1.0mm Total Length : 32mm Exceptionally High Quality Jewelry!