Material: Zinc alloy. Can be widely used in indoor. Dimension: Chain's Length 19.2", Thickness: 0.2"; Carabiner 3.14", Thickness 0.3". Max Load: 330lb (150kg). Easy to Use: Just connect the spring snaps with your loved hanging chair or hammock, and you can enjoy yourself. Use Range: Perfect for Hammock Chairs, Porch Swings, Swing Chairs, Punching Bags, Aerial Yoga or hanging any other heavy object. Package Included: 4x Chains; 8x Carabiner.