The practical PROFI-BOX with fischer DuoPower 6 and 8 mm 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: The Master box is ideal for workshop and construction site and offers an optimum price/performance ratio. The transparent lid provides an overview at a glance. It closes securely and can be refilled with plugs The duo of two different materials and its multiple functional abilities (expanding, folding, and knotting) extend the range of applications to additional materials with top loads 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-run