Sturdy construction, galvanized to protect from weatherPerfect use for hanging chairs, hammock, porch swings, punching bags, swing chairs, heavy bags and other object from overhead mountFit Almost All Punch Bag,Hanging Chairs,,Egg Chair,wicker basket Gardfor Added Weather Resistance;Spring Rated over 500lb capacity.The spring helps relieve stress from impacts, provide a more comfortable, softer feel and will increase the lifespan of your hammock, in addition your mounting surfacecolour: SilverMaterial: metalsize: 108*40mmPackage Contents: 1*Chair springOnly the above package content, other products are not included.Note:Light and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/- 1-3cm.