Widely Used.High quality stainless steel spring for hanging chair, hanging seat, hammock, swing for two or baby swing, for anything you want to attach to the ceiling and need to swing. Quality material.304 stainless steel for anti-corrosion and anti-rust, with long service life. The telescopic spring has been tested for tensile strength and started to deform at approximately 250 kg, without breaking. The spring helps relieve the stress of shocks. The steel spring allows to cushion movement in a light and pleasant way, conducive to relaxation, especially when fixed to a concrete ceiling, the spring reacts gently for pleasant rotation and swinging movements. Easy to mount. Comes with 2 large carabiners, extremely strong thanks to a special hardening process, the carabiner (8 mm thick) allows quick, simple and secure attachment.