Attach the SMART BRACKET PRO DOLLY to your PRO VIDEO TRIPOD to create smooth pan and rolling camera work. Allows easy movement of filiming apperatus in high traffic area. Made of (3) heavy duty steel arms with large, 3" - 360 degree rotating rubber casters for full-fluid and quite motion. In addition, castors features easy-snap wheel locks for when tripod needs to stay securely in place. Adjusable leg mounts allow for attachement of most brands of tripods. Dolly folds for easy transport and includes a nylon travel bag.