The Interfit Strobies Honeycomb is a versatile tool for photographers who like to create a stylized lighting set up, it can be used to add a fill light on the side of the face or to provide you background lighting. A flex mount (sold separately) is needed to attach this to your flash unit. Flex Mounts (sold separately)are available to fit the following flash units: order code SGM100 for Nikon SB600 / SB800; order code SGM200 for Sony F32X / Canon 430EX; order code SGM300 for Sony F56AM / Nikon SB26/27/28; order code SGM400 for Canon 580EX / 550EX; order code SGM500 for Vivitar 285 HV; order code SGM600 for Nikon SB900. order code SGM700 for Canon 580EXMKII.