1. Any angle can be adjusted, all movable joints can be tightened only by tightening the central knob 2. Friends who use a follow focus device, when taking photos or videos, it can be used to mount LED lights, flashes or LCD monitors, with your DSLR cage, HDSLR camera, track rod (clip) 3. This precise and design, when the lock arm controls the magic knob or releases, it can be installed at any position and moved at will 4. Simplify the installation position of the magic arm and adjust any photography lighting 5. This magical arm with precise design allows installation options. 6. Supply 1/4 inch screw adapter suitable for camera, lamp holder and other accessories. Colour: black Material: aluminum alloy Size: 15x3x5cm Package Contents: 1 * 11-inch magic arm 1 * crab claw 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.