Usage Tips:INDOOR & OUTDOOR USE:Perfect for hammock chairs swing, porch swings, swinging chairs, punching bags, or hanging any other heavy object of an overhead mount. EASY TO INSTALL:Pilot hole needs to be drilled in the wood or Metal Beam prior to installation.When mounting on wood, place two tight nuts and washers on top and tighten.When mounting on a metal beam, place one of the nuts and washers on top and the other on the other side of the beam and tighten. INNOVATIVE DESIGN: Design with a strong heavy duty hook, the hook can swing back and forth with 180. And to ensure the safety, we have assembled an O ring with material SUS304 stainless steel to avoid the shaft slide out, also the buckle of the hook is strong enough to ensure the safety use. CORROSION RESISTANCE,HIGH HARDNESS:304 stainless steel rings made of raw materials.No rust,corrosion resistance, high hardness, non-toxic and pollution-free environment.Suitable for any scene.