Combination of 2 material components for more performance Secure functions for solid (expansion) and hollow and panel building materials (folding/knotting) Easy installation: narrow edge of the plug prevents it from falling deeper into the drill hole Best possible feedback from the anchor, you can feel that the anchor is sitting perfectly With the appropriate round hook screw for a perfect hold Two component materials for top load values and intelligent functioning depending on the substrate Great feedback (feel-good factor) of the plug You can feel exactly when the plug is installed perfectly The narrow plug rim prevents slipping into the drill hole The serrated anti-rotation feature prevents rotation in the drill hole during installation