The Gesipa 216303595 is a professional-grade blind rivet designed for secure fastening applications requiring aluminum-to-steel connections. This package contains 500 units of 4.0 mm diameter rivets with an 8 mm grip range, manufactured from aluminum bodies and steel mandrels for optimal strength and corrosion resistance. These grooved blind rivets feature a serrated shank that provides enhanced vibration resistance and improved pull-out strength compared to smooth shank rivets, making them suitable for applications where movement or stress might compromise standard fasteners. The aluminum body offers good corrosion resistance while maintaining lightweight properties, and the steel mandrel ensures reliable setting and high clamping force. With a grip range of 8 mm, these rivets accommodate material thicknesses from approximately 2 mm to 10 mm, providing versatility across various assembly scenarios. The grooved design creates a mechanical lock within the drilled hole, reducing the risk of rotation or loosening over time. These rivets are compatible with standard blind rivet tools and require access from only one side of the workpiece, making them ideal for applications where the back side is inaccessible. The 500-piece quantity provides sufficient inventory for production environments, maintenance tasks, or construction projects requiring multiple fastening points. The Gesipa brand represents German engineering precision and consistent quality in fastening technology, with these rivets manufactured to exacting tolerances for reliable performance. Proper installation requires a pre-drilled hole of 4.1 mm to 4.2 mm diameter, and the rivets should be stored in a dry environment to prevent oxidation. These fasteners are commonly used in metal fabrication, automotive repair, HVAC installation, electrical enclosure assembly, and general industrial maintenance where durable, vibration-resistant connections are essential between aluminum and steel components.