The Digital Juice SlyderDolly Mounting Adapter with an industry standard 3/8"-16 top and bottom screw attachment allows you to attach a ball head or any gear to a SlyderDolly trolley plate. While detaching the ball head and the camera, you can leave the adapter attached to the dolly, which makes it easier and faster to attach the same camera rigs or different rigs through the 3/8" screw.