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 performs well in practical use. Pre-drilled expansion screws for concrete application installed in just minutes. Spring Snap 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 attach important items. 180° Rotation: 180° rotation, custom-made silent nylon bushing and specially designed lubricating grease to prevent metal friction, creating a quiet, smooth and exceptional swinging motion with no maintenance. Widely Application: For indoor and outdoor use, applicable to concrete ceilings and wooden beams, the best anchoring solution for all