This combination allows you to attach your camera, monitor, or other devices with a 1/4 inch threaded hole to shelves, glass, crossbars, steel, or desks. It's easy to install, adjust, and remove. Features a 360-degree ball head mount for angle adjustments. The clamp rotates 180 degrees, allowing you to mount your camera kits as needed. The 1/4 screw adapter is a universal dual-head adjustable mount for LED lights, monitors, mobile phone selfie sticks, bicycle phone holders, and action cameras. The aluminum alloy knob locks securely by turning clockwise and loosens by turning counter-clockwise. The knob limit adjustment design ensures the ball head won't detach from the bracket when adjusting its position, preventing it from falling off due to over-adjustment and damaging connected equipment. Maximum load capacity is 5 kg. Ball joint diameter: 12 mm. Screw diameter: 1/4 inch. Style: D: One long 1/4 screw hole with a short 1/4 screw at both ends. Material: Aluminum Alloy. Color: Black+Red. Package Contents: 1 x Ball Head Adapter. (Other products are not included.) Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. The allowed measurement error is +/- 1-3 cm.