The Interfit Strobie Twin Metal Umbrella Bracket allows you to mount 2 shoe mount flashes to a single stand. The all-metal bracket features a tilt and swivel mount with a 5/8" receiver and an umbrella shaft socket which accommodates virtually all standard (7 - 8mm) umbrella shafts. Doubling your flashes doubles power (x 1 stop) and widens the beam spread of the flash into the umbrella.