Leofoto's AM Series Versa Magic Arm Kit is a multi-purpose tripod accessory that 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. It attaches to compatible Leofoto tripods and other tripod camera brackets with a 3/8th threaded hole. Each end of the magic arm features a ball-and-socket joint that rotates 360° , and the center elbow joint locks in any position. Additionally, the large, easy-to-grip center knob locks all three movements simultaneously for quick and easy setup and repositioning. Features of the Leofoto AM-4 155mm Versa Magic Arm: Folded length: 155mm / 6.10in Extend length: 292mm / 11.49in Width: 53mm / 2.08in Weight: 239g / 0.52lb Max. load: 3kg / 6.61lb Leofoto AM-4 155mm Versa Magic Arm w/Anti-Twist Adapter & 3/8" Mounting Studs AM-4-KIT