From Manufacturer
The Manfrotto TriFlash by Joe McNally is a further refinement of the original TriFlash. In use, sometimes the positioning of the IR sensor can become problematic. This Joe McNally version features unique rotating shoes for all 3 flashes to ensure that the sensor on each flash "sees" the on-camera master flash. The mount also features an umbrella receptacle and a 5/8" (16 mm) stand mount.
Attach up to three flash guns
Umbrella socket
Rotating shoe mounts
Screw locking
Can be mounted onto standard brass spigot