This is a kidney hook, a somewhat unusual type of hook finding. It locks with the U-shaped part, making it a simple and practical design. Also, by simply attaching a charm, it becomes a cute, dangling earring. I used to attach the charm and then use pliers to pinch the neck of the lower right protrusion to secure the charm and prevent it from falling off. #AllergyFriendlyEarringFindings #HookEarrings 31