The practical PROFI-BOX with fischer DuoPower 6 and 8 in short and long versions with suitable screws. Two component materials for top load values and intelligent functioning depending on the substrate. The DuoPower is suitable for pre-positioned and push-through installation. Features: Depending on the building material, the grey components made from high quality nylon automatically activates the optimum product function (expansion, folding) for the best hold The serrated anti-rotation feature prevents rotation in the drill hole during installation The short plug length ensures fast fixing without deep drilling. Narrow plug rim prevents slipping into the drill hole The expansion wings of the red component support the secure expansion and offer additional security to the grey component The smooth-running opening ensures the simple positioning of the screw and secure guiding and fixing in the screw channel The required screw length is given by the plug length + fixture thickness +1 x sc