Anti-Drop Design: There is a rotation stop screw at the handle to limit the degree of the knob. The product can only be rotated until the ball head can be adjusted, and the angle can not be screwed out, so as to prevent the ball head from falling. Sleeve slide Rail design prevents ball head jamming: Most of the old version of butterfly clips rely on screws as guide rails, which easily leads to locking only one ball head. This new version uses the aluminum alloy guidepost as a guide rail to avoid locking only one ball head and sticking the ball head. Expand to use more devices: Multiple expansion screw holes 1/4inch 3/8inch , meet the installation requirements of customers. Not only for Diving ball head clamping but also for monitor and adapters. Made of Aluminum Alloy material: Corrosion-resistant aluminum alloy (hard anodized body) meets the highly accurate and durable requirements. Function: Perfectly connected with the ball head to plug in the fill light, diving flashlight arm or action camera, etc. when normal and underwater photography. Features: Made by Aluminum alloy, , durable, and anti-corrosion, can rotate 360-degrees and can rotate about 80 degrees in the horizontal direction, have more freedom to adjust the flash direction. multi-position free connection and fixation, have more freedom to adjust the flash direction. Multiple expansion screw holes 1/4inch 3/8inch , meet the installation requirements of customers. Usage: The ball clamp is used to attach 2 arms, base adapters, and strobes together, the clamp mount for 1-inch ball arms for Hero 9 8 7 6 5 4 3+ 3 4k action camera accessory, and others. Ergonomic Design: Ergonomic spinning handles design, naturally suitable for fingers and made of resin to enhance its operability, with lower power consumption, easy to lose, adjust the relative angle of the joint arms firmly clamp the ball joints. Have a higher degree of freedom to adjust the flash direction. A wide range of strong practicality is photography enthusiasts a great choice. Size: 42 x 70 x 24.5mm Weight: about 60g Compatible Action Camera Brand: for 4k, , , , , , , , , , Camera Colour:black Material:Aluminum alloy Package Contents: 1 x diving clamp mount Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.