1. The sleeve slide rail design prevents ball head jamming: Most older versions of butterfly clips rely on screws as guide rails, which often leads to only one ball head being locked. This version uses an aluminum alloy guide post as the rail to avoid single ball head locking and prevent the ball head from getting stuck. 2. Antidrop design: A rotation stop screw is installed to limit the button's range of motion. The product can only rotate until the ball head can be adjusted and cannot be fully unscrewed, preventing the ball head from falling off. 3. Made of lightweight aluminum alloy material: The corrosionresistant aluminum alloy (hard anodized body) meets precision and durability requirements. 4. Expand compatibility for more devices: Multiple expansion screw holes (1/4', 3/8') meet various installation needs. It is suitable for immersion ball head clamps, monitors and adapters.