- Pack of 20 GUNGY 20mm extension springs with double hook for secure connections - Made of high-quality 304 stainless steel, resistant to rust and corrosion - Wire diameter: 0.3mm; outer diameter: 3mm; static length: 20mm - Polished surface, burr-free, ensuring long service life and smooth operation - Maximum spring force: 0.23KG (2.25N); maximum stretch length: 25mm - Double hook design for easy installation on cords, straps, carabiners, and eyelets - Wide applications in production, assembly, research, and maintenance projects - Suitable for tents, trampolines, toys, exercise equipment, appliances, and automobiles - Versatile and durable solution for industrial and DIY needs