This Joe McNally Ezybox Hotshoe Softbox is designed to fit most manufacturers' hot shoe, tilt-head flashes including the Nikon SB900. It measures 24 x 24" (61 x 61 cm) and its depth is sufficient to provide real softening of the flash. It assembles easily in minutes. Unlike the standard Ezybox, Joe's version features a white interior for a softer look. The included bracket fits on a standard 5/8" (16 mm) light stand stud and has vertical adjustment to center your flash in the box. An optional tilting bracket is available for more extensive flexibility.