Two material components for even more expansion volume and best load values in solid and perforated building materials. Intelligent, self-activating functions depending on the substrate. For a wide range of applications. Best possible feedback (feelgood factor) of the anchor. You can feel when the anchor is perfectly in place. No annoying rotation of the anchor during installation, thanks to the distinctive rotation locks. The smooth-running opening allows the screw to be easily inserted and securely guided and fixed in the screw channel. The long versions offer additional "bite" in problematic building materials.