QUIET AND SMOOTH:Custom silent nylon bushing specially designed to prevent metal rub creating a quiet.The innovative design of the lubrication system makes the hardware swing smoother and it is very convenient to add lubricants.Maintain long-term smoothness and stability.INDOOR & OUTDOOR USE:Perfect for hammock chairs swing, porch swings, swinging chairs, punching bags, or hanging any other heavy object of an overhead mount.CORROSION RESISTANCE,HIGH HARDNESS:304 stainless steel rings made of high quality raw materials.No rust,corrosion resistance, high hardness, non-toxic and pollution-free environment.Suitable for any scene.EASY TO INSTALL:We've pre-drilled two holes for bolting to wooden beams or concrete.Includes 4 hex lag bolts,and a unique one piece design and can be installed in minutes.