The Interfit Strobie Twin Metal Umbrella Bracket means that you can mount 2 shoe mount flashes to a single stand The all-metal bracket features a tilt & swivel mount with a 5/8" receiver & an umbrella shaft socket which accommodates virtually all standard (7-8 mm) umbrella shafts. Doubling your flashes doubles power (x 1 stop) & widens the beam spread of the flash into the umbrella Using the same shoe mount available on the Strobies XS Brackets, with large thumbscrews enables you to adjust your flashguns even with gloves on. With spring loaded handles the brackets will stay in place without dropping, so you can always be confident that your lighting will stay in the position you placed it in Can be used with most sizes & types of umbrellas with 7 or 8 mm. shafts. Please note: Flashguns, Umbrellas & Lighting Stands are not included, we recommend COR751 stands for indoor & COR752 / COR753 for outdoor work.