• Tension springs with double hook design for easy connection to cords, straps, and carabiners. • Made of high-strength and elasticity piano wire (SWP), with a polished rust-resistant surface treatment. • Wire diameter: 3,2 mm, outer diameter: 20 mm, and static length: 125 mm. • Maximum spring force of 28,7 kg (281,5 N) with a maximum traction length of 27,8 mm. • Smooth and burr-free surface, free of impurities for a long service life. • Ideal for assembly projects, maintenance, exercise equipment, home appliances, and automotive.