The clamp is adjustable to fit many boom diameters. Connect a boom arm to a stand. Enable to adjust the height, angle, and other positioning. A great addition to multiple uses in your studio. The single swiveling head bracket clamp can slide onto your light stand and hold equipment, such as boom arms, in place. It is easy to use and allows you to adjust the height, angle, and other positioning of your equipment. Material: ABS Color: Black Item Size(without hand grip): 7.7 * 4.1cm / 3 * 1.6in(Diameter * Height) Item Weight: 223g / 7.9oz Package Contents: 1 x Single Swiveling Grip Head Clamp 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.