Allowing the use of 3 hotshoe mounted flasguns together the lastolite triflash bracket with locking shoe mount features an adjustable screw locking shoe mount which offers an additional locking mechanism to work alongside the built in method used on the flashgunthe dimensions of the hotshoe on the bottom of each flashgun can vary from one gun to the other however the triflash shoe lock can comfortably accomodate these variances including the nikon sb900