From Manufacturer
Supporting up to 4.4 lb, the Neewer ST20 Magic Arm with Super Clamp has a total length of 11". Use the clamp and arm combination to position and support a variety of devices such as small lights, monitors, cameras, and more. Its two integrated ball heads allow multiple angle adjustments with 360° rotation. For maximum compatibility, the magic arm features a 1/4"-20 threaded screw at one end and a cold shoe adapter at the other.
The included clamp incorporates 1/4"-20 and 3/8"-16 threaded holes, making it well suited for use with a wide variety of accessories and gear. It offers a clamping range of 0.59 to 2.05" for attachment onto table edges and other compatible surfaces. Both the clamp and the magic arm are made of aluminum alloy and stainless steel to increase robustness and durability. In addition, they are fitted with rubber pads to prevent scratches and help lock equipment in place.