The Tethermate for Mac Book 15 and other similar sized laptops offers a simple and portable solution for shooting direct to your laptop on location. The 17.5″ x 11.7″ (445 x 286.5 mm) size includes 1/4″-20 and 3/8″-16 female threads on its underside to mount directly on a tripod or any equipment that comes with 1/4″-20 and 3/8″-16 male threads. Three mounting slots under the portable plate make it easy to connect additional accessories with the U-shaped sliding plate. The spring located knob is also included to keep the U-shaped sliding plate securely in place.