The Fischer DuoPower offers very good hold values as a result of its 2 components: Depending on the building material, the grey components made from high quality nylon automatically activates the optimum product function (expansion, folding, knotting) for the best hold. The expansion wings of the red component support the secure expansion and offer additional security to the grey component. Features: The greater anchorage depth of the DuoPower 8 x 65 means that the plug is especially suited to fixings in hollow building materials, aerated concrete and to bridge plaster The serrated anti-rotation feature prevents rotation in the drill hole during installation The narrow plug rim prevents slipping into the drill hole Great feedback (feel-good factor) of the plug. You can feel exactly, when the plug is installed perfectly Suitable for pre-positioned and push-through installation. For use in all building materials The required screw length is given by the plug length + fixture thickness +