This ProMediaGear PBSA7m2 Sony Alpha 7 a7 a7R Mark II Arca-Swiss type Plate is custom fitted for Sony Alpha 7 Series a7 a7r MARK II. The bracket plate can be mounted to ProMediaGear flash brackets or L-Brackets. Since it is  custom designed it fits like a glove perfectly matching the camera shape, it also provides anti-rotation so the plate won't slip or twist. The plate has been machined from solid Aluminum T6061 block and has hard black anodized surface coating  for scratch resistant finish. The plate also features 1/4-20 threads for mounting other quick release plates or accessories.