'The Fischer Duo Power gives very good hold with 2聽components: the grey component from high quality nylon is activated automatically depending on the building material the optimal functional principle (spreading, flaps) For Optimum Grip. The expansion wing of red component support the secure Verspreizung and offer additional safety for component. Easy to screw in the screw head and handles "pulled to end. No screw the screw head. Attaches to the head Angeformten rim prevents the dowels into the bore hole. The Duo Power is the first choice for the anchoring for example from shower curtain poles, mail boxes, lights, motion sensors, signs and house number.