Anti Drop Design A stopper screw on the handle limits the rotation range so the ball head can be adjusted but cannot be unscrewed or detached, preventing accidental drops. Expand to Use More Devices Supports multiple 1/4" and 3/8" expansion screw holes to meet a variety of installation needs. Not only for tightening the diving head, but also suitable for monitor arms and adapters. Slide Rail design The sleeve slide rail prevents the ball head from being blocked. Unlike older butterfly clips that use screw-guides, this version uses an aluminum alloy guide post as the guide rail to block and clamp the ball joint reliably. Made of Lightweight Aluminum Alloy Corrosion-resistant aluminum alloy with a hard anodized body delivers high precision and durability. It connects directly to the ball head for mounting auxiliary lights, diving flashlight arms, or action cameras for both normal shooting and underwater use. Use scenarios - Underwater photography: secure mounting for dive lights or action cameras, with anti-drop protection during deep dives. - Field or studio work: attach monitors or adapters to enable live view and easy adjustments. - Flexible rigging: compatible with lights, arms, and other accessories for versatile configurations in photography and videography.