The ceiling hook is made of SUS304 stainless steel, which is anti-corrosion, anti-rust, non-toxic and harmless, and durable. 360 Degree Rotation 360 Material Ceiling Hammock Hooks can be rotated freely for wide use and avoid tangling or twisting. Indoor and Outdoor Use Ceiling hooks for wood concrete sets, hammocks, sandbags, chandeliers, outdoor swings, hanging chairs, aerial yoga, climbing ropes, basically meet most items you need to hang. Easy to install The hammock hook comes with 2 bolts for concrete applications and 2 screws for wood applications, the product itself has reserved two holes for the screws to pass through, whether it is on concrete or wood, it can be done in a few minutes Complete the installation within.