Expansion Screw Petal Nuts for Secure FasteningAchieve strong and reliable fastening for all your projects with these versatile expansion screw petal nuts. Designed for ease of use and exceptional grip, they are perfect for a variety of materials and applications. Features: Effortless Application: Installing these fasteners is straightforward. Begin by drilling a hole to the specified diameter, then insert the anchor until it's flush with the surface. Use a setting tool (or a screwdriver for