SmallRig Universal Magic Arm with Small Ball Head 2158 is made of two ball-head magic arms with a ball head diameter of 9mm. Each magic arm is equipped with 1/4”-20 screws at both ends. It could attach camera cage, top plate and Top Handle 1955/1984 on the one end, while attach monitor or video light on the other end. It features a wingnut in the middle to adjust the angles and positions of monitor or video light or other accessories.