Stainless steel material, used to install hammock chairs and other hanging accessories, such as sandbags, hanging plants, etc. Ceiling installation stainless steel mounting plate is firmly bolted to beams, wooden boards or any other elevated surface. High load-bearing capacity: up to 500 pounds. The spring helps to increase the elasticity and increase the experience of using the hammock. The heavy-duty hammock suspension kit will be firmly clamped to your swing chair or hammock, allowing you to rotate freely. Very suitable for hammock chairs, sandbags, porch swings or hanging other heavy objects.