The Fischer DUOPOWER offers excellent holding values through two components: The gray component made of high-quality nylon automatically activates the optimal function principle (expansion, folding) 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. Simply screw in the screw and pull it tight at the end. No over-tightening of the screw. The molded edge on the anchor head prevents the anchor from slipping into the drill hole. The DUOPOWER is the first choice for fastening items such as shower curtain rods, mailboxes, lights, motion detectors, signs, and house numbers. Top features: Combination of two material components for enhanced performance. Safe functions for solid (expansion) and hollow building materials (folding). Easy installation: narrow anchor edge prevents slipping into the drill hole. Best possible feedback from the anchor - you can feel that the anchor is perfectly seated. Comes with a matching screw 4.5 x 40 for perfect hold.