The Fischer DuoPower offers very good holding values through two components. The gray component, made of high-quality nylon, automatically activates the optimal functional principle (expansion, folding, knotting) depending on the building material for the best grip. The expansion wings of the red component support secure expansion and provide additional safety to the gray component. Simple screwing in of the screw and proper tightening at the end are required. There is no over-tightening of the screw. The edge formed on the anchor head prevents the anchor from slipping into the drill hole.