HEAVY DUTY HOOK: This stainless steel ceiling and wall hook is ideal for hanging heavy equipment and indoor decorations. Our set consists of 1 swivel hook, 1 fixing hook, 2 screws and 2 expansion screws. The main plate measures W7 x D4 x H9.6 cm, while the hook measures L8 x W4 cm. See image 2 for full dimensions. The swivel hooks can support a maximum load of 400 kg. 304 STAINLESS STEEL: This quality 304 stainless steel ring is extremely durable and strong. The material is very hard, non-toxic and environmentally friendly. Stainless steel does not rust and resists corrosion, and these hammocks can be set up indoors or outdoors, they are ideal for professional purposes and can withstand long-term use. They are easy to clean and can be attached and removed multiple times. EASY INSTALLATION: Each sandbag hook is drilled with 2 holes for easy attachment to a ceiling or wall. Hex screws (expansion screws) are made for concrete, and other screws are made for wooden surfaces. Our set is easy to install and no complicated assembly is required. The innovative concept of this swivel hammock hook allows for full 360° rotation. So there will be no twisting or tangling of the hardware. MULTIFUNCTIONAL CEILING HANGING HOOK: These swivel hooks are ideal for hanging ceiling lamps and have many uses. Set up your hammock, swing, hanging chair, aerial yoga strap, sandbag, playground or porch swing, gymnastics ring, Olympic ring or resistance band. They will support your equipment for a long time. Use them for smaller decorations, such as planters, lanterns and other light fixtures.