1. A single locking knob can be quickly locked and loosened. 2. Independent joints, faster turning direction. 3. Fit the upper and lower tooth surfaces to prevent slippage and increase the locking force. 4. The ball head and thread are made of stainless steel, which is firmer and more reliable. 5. Equipped with a 360 swivel head at the end of the magic arm when you need the device at any angle, it allows you to use it comfortably. 6. Suitable for HDV HDSLR movie production, especially for taking photos or videos with follow focus, can be used to mount LED lights, flash lights or LCD monitors to your DSLR rabbit cage, HDSLR camera, rail pole (clip) or shoulder bracket.