This iPad / tablet tray screws onto most any tripod that has a standard size 1/4"-20 threaded stud. It is also compatible with the Onyx vehicle laptop mounts. Made from strong ABS plastic, this tray offers a convenient and attractive means of holding a tablet style computer device on a tripod or vehicle laptop mount. Also can be used with laptops that fit within the dimensions above. Small wing knobs on the bottom of tray are used for locking the holding tabs in place. Once inserted properly, the tray can be completely flipped upside down and still hold the iPad / tablet firmly in place.