The Joe Mc Nally Tri Grip Kit from Lastolite offers you the tools to accomplish the type of on-location lighting for which Joe Mc Nally is so well-known. The Tri Grip kit can be used as a reflector or a diffuser--it features a 2-stop diffuser panel, a Tri Flip reflector sleeve & a window mask sleeve. For a reflector, just slip the reflector sleeve over the diffuser panel & select one of the four surfaces, according to the effect you want: Silver, Sunfire, Sunlite, or Soft Silver. The second sleeve is all black with a 21.25 x 15" (54 x 38 cm) cut-out window opening which reveals the diffuser panel underneath, creating a rectangular shoot-through panel for battery-operated flashguns. There are two additional black panels with which you can control the light more precisely by changing the size & shape of the window.