High-quality nylon plugs transfer force optimally in the building material through 4-way expansion. Fixing blades ensure pre-fixation of the screw so it does not need to be additionally held in place for overhead applications. Flexible plug edge prevents the plug from slipping deeper into the drill hole for secure installation. Provides a secure hold in a wide range of solid and perforated building materials. Nylon Construction Suitable for Aerated Concrete Suits 4 - 5 x 35mm Screws Anti-Slip Collar 4-Way Expansion Fixing Blades for Flexible Mounting Suitable for Pre-Positioned & Push-Through Installation Nylon Construction Suitable for Aerated Concrete Suits 4 - 5 x 35mm Screws Anti-Slip Collar 4-Way Expansion Fixing Blades for Flexible Mounting Suitable for Pre-Positioned & Push-Through Installation