Universal Double Ball Head Magic Arm 9cm This is a small metal arm that allows you to fix accessories such as monitors and LED lights to camera cages and other equipment at any angle. By tightening the central knob, both ball joints at each end are simultaneously locked firmly. The connection parts at both ends are standard 1/4 inch male screws. The total length is approximately 9cm based on estimated dimensions from the grid. Red O-rings are attached to the ball parts to increase holding power, and the main body is made of durable aluminum alloy. This listing is for the arm body only. There are signs of use such as scuffs and paint peeling in various places on the surface, but the movable parts and the locking power of the knob are not affected, and it can be used normally. #MagicArm #BallJoint #CameraRig #RigParts #SmallRigCompatible #VideoShooting #VideoProduction #ShootingEquipment #ExternalMonitor #LEDLight