The Gesipa 216303676 blind rivet set offers 500 pieces of aluminum/steel blind rivets with a diameter of 4.0 mm and a length of 16 mm for secure and durable connection applications. These blind rivets feature a grooved mandrel design that provides improved grip and vibration resistance, making them suitable for various materials such as sheet metal, plastics, and composites. The construction with an aluminum body and steel mandrel ensures good corrosion resistance while providing reliable tensile strength for industrial, automotive, and construction applications. Each rivet requires a standard 4.0 mm rivet tool for installation and creates a firm, flush connection from one side of the workpiece without needing access to the backside. The set includes 500 pieces in convenient packaging for easy storage and use, with consistent quality and precision across all fasteners. These grooved blind rivets are particularly effective in applications where vibration resistance and secure fastening are priorities, such as in electrical enclosures, vehicle components, and machinery assemblies. The aluminum/steel combination offers a balanced ratio of lightweight design and lasting performance, while the grooved design prevents rotation and maintains alignment during installation. Proper installation creates a permanent, tamper-proof connection that withstands environmental influences and mechanical stress. The size 4.0 x 16 mm is versatile for medium-duty applications requiring reliable fastening in various material thicknesses. This product represents a practical solution for professionals and workshops needing consistently high-quality blind rivets for assembly and repair tasks across various industries.