Aluminum Material The Ball Joint Clamp Is Made Of Aluminum Material And 316 Stainless Steel Screws And Springs. Makes It More Durable And Sturdy When Using Under Seawater. No Rust After Diving. Tested Concave Surface Design The Special Concave Surface Design Allows Us To Clamp The Ball Tightly, And When The Lighting Position Is Changed, It Is Easier To Loosen And Tighten. Applications Nitescuba Standard Clamp Used To Attach Two 1 Inch Standard Ball Mounts To Each Other, For Example, It Is Not Allowed To Clamp Only One Ball Mount, It Must Be Used When Clamping Two Balls Together. 360 Rotation Design. Adjusted By The Firmness Of The Handle To Realize The Function Of Multi Angle Shooting.