High Safety Factor: The black screw-in eyebolts combined with the elastic safety buckle design can maximize the protection of items against falling in indoor and outdoor environments. Easy to Install: Simply use a hammer, wrench or drill to screw or drive the heavy duty screw-in hook into a wooden or concrete wall. The screw-in design facilitates a better grip in the wall for quick installation. Long service life: The wooden ceiling hooks are made of carbon steel with a black zinc finish for high load-bearing capacity. It is waterproof, rust-proof and non-slip, and can be used for a long time in indoor and outdoor environments. Wide range of applications: The black screw-in eyebolts are suitable for indoor and outdoor environments, and can be used to hang large objects such as potted plants, lanterns and birdcages, or to place small objects such as cups.