Heavy duty steel construction. Zinc plated and clear coated for increased weather resistance. Very strong and can be used for a long time. The spring helps relieve stress from impacts, provides a more comfortable and softer feel and will increase the life of your hammock, as well as your mounting surface. Compatible with almost all punching bags, boxing bags, hanging chairs, cocoon, egg chairs, wicker chairs, etc. Spring capacity rating of over 700 lbs. Package Contents: 2 x Carabiner. Wire Diameter: 7mm/0.3" (Approx.), Length: 108mm/4.25" (Approx.).2pcs Heavy Duty Extension Carabiner Hanging Hook Accessories Swing Chairs Fishing Spring Bag for Hanging Chair Hammock and Swing. - Heavy duty steel construction. Galvanized and clear coated for greater weather resistance. - The spring helps relieve stress from impacts, provides a more comfortable and softer feel, and increases the life of your hammock, in addition to your mounting surface. - Spring rated capacity of over 700 lbs. - Suitable for almost all punching bags, hanging chairs, cocoon, egg chair, wicker basket. Details: Item Name: Spring Hook Material: Metal Quantity: 2 Pcs Features: Hammock Accessories, Durable, Weather Resistance Wire Diameter: Approx. 7mm/0.3" Length: 108mm/4.25" (Approx.) Package Includes: 2 x Garden Swing SpringsLonvre