[Safe and Easy to Install] These ceiling hooks, made of metal, offer maximum rust and corrosion protection. They safely support up to 450 kg thanks to a welding process and are suitable for both indoor and outdoor installation. We have pre-drilled two holes for screwing into wood or concrete, allowing for installation in minutes. [360° Rotatable Design] Featuring a strong, heavy-duty hook, this design allows the hook to rotate 360° and swivel back and forth 180°. This makes the hook more flexible and reduces shaking. For safety, we've installed a metal O-ring to prevent the shaft from slipping out. The hook's buckle is also strong for added safety. [Pure Relaxation] The hanging chair swing spring set allows you to swing, rock, and turn gently and comfortably, absorbing bumps. With the steel spring, you can enhance your hanging chair and create the most sophisticated seating option. [User-Friendly Operation] The ceiling hook hanging chair set includes two pre-drilled holes for screwing into wood, rafters, or concrete. Simply mark the mounting holes with a pen and then drill. Tighten the expansion screws or wood screws and hammer them in. [Versatile Use] This professional ceiling mount and spring are perfect for hanging chairs, lamps, swings, love swings, hammocks, punching bags, sling trainers, yoga towels, awnings, and more. Color: Black Material: Metal Package Contents: 1 x Ceiling hook 1 x Carabiner 2 x Expansion screws 2 x Screws Only the above package contents are included; other products are not. Note: Light and different displays may cause the color of the item in the picture to differ slightly from the real thing. The measurement error allowed is +/- 1-3cm.