【Quality Materials】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】This product has 4 holes on the mounting surface with bolts to ensure sturdiness and safety, which works well in practical use. Pre-drilled expansion screws for concrete application installed in just minutes. 【Spring-loaded carabiner hook】Versatile fastening, rigging and anchoring hardware - Allows quick connection / disconnection of ropes, chains, straps; Opens and closes smoothly as the spring-loaded door makes it easy to secure important items. 【180° Rotation】180° rotation, custom-fit silent nylon bushing and lubricating grease specially designed to avoid metal friction, creating quiet, smooth and outstanding rocking motion, maintenance free. 【Widely Application】For indoor and outdoor use, applicable to concrete ceilings and wooden beams wood, the best anchoring solution for