about this product: Quality material. 304 stainless steel for anti-corrosion and anti-rust, with long service life. The telescopic spring was tested for tensile strength and started to deform at around 250 kg, without breaking. Spring helps relieve shock stress. The steel spring cushions movements in a light and pleasant way, conducive to relaxation, especially when fixed to a concrete ceiling, the spring reacts gently for pleasant rotational 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 safe attachment. 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. Product Description: Spring Hook Features: Spring with two carabiners for hanging in the garden or at home. Made of very robust stainless steel, rust and moisture are no longer a problem. The steel spring cushions movement in a light and pleasant way, conducive to relaxation, get ready for all new sensations in your hanging chair. At both ends are closed eyelets in the 180 degree position. The two large carabiners are hooked into the eyelets of the spring, easy to hang in a hook hanging from the ceiling. Perfect for hammocks, porch swings, swing chairs, punching bags, or hanging anything heavy from a hanging rack. Can be used both indoors and outdoors. Specification: Material: 304 stainless steel. Load capacity: 250kg. Spring Length: Approx. 15cm. Carabiner Length: Approx. 8cm. Condition: brand new. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The allowable measurement error is +\/- 5mm. Package contents. 1 x spring hook. 2 x Carabiner