Interfit STR118 Flexi Adapter Arm with Hotshoe Adapter Description. The Interfit Strobies Flexi Adapter Arm with Hotshoe Adapter STR118 is part of the Interfit Strobies flashgun accessory range. Add an additional hotshoe flash gun to an INT273 Reflector arm kit to enable you to create a reflected light source which will be softer than when compared to the flash gun being placed directly in front of your subject. Picture here shows the flexi arm clamped on to the Light stand of the 5 in 1 reflector arm kit INT273. The clamp can also be used on a door or bookcase the flexi arm is 30 cm 12 & the jaws can be used up to 35mm 1