Leofoto Versa Magic Arm Multi-Purpose Accessory w/ 1/4th Mounting Screws Black. The magic-arm allows a light microphone monitor smartphone tablet or even an additional camera to be affixed to a camera rig without the added bulk of a clamp. Each end of the magic arm features a ball-and-socket joint that rotates 360degrees and the center elbow joint locks in any position. The large easy-to-grip center knob locks all three movements simultaneously for quick and easy setup and repositioning. Specifications for Leofoto AM-4 Versa Magic Arm Multi-Purpose Accessory w/ 1/4th Mounting Screws: Manufacturer: Leofoto Color: Black Features of Leofoto AM-4 Versa Magic Arm Multi-Purpose Accessory w/ 1/4th Mounting Screws Aluminum CNC Machining Package Contents: Leofoto AM-4 Versa Magic Arm Multi-Purpose Accessory w/ 1/4th Mounting Screws Leofoto AM-4: AM-4 Versa Magic Arm Multi-Purpose Accessory w/ 1/4th Mounting Screws Black