[Safe and reliable & easy to install] Our ceiling hooks made of high quality metal offer maximum rust and corrosion protection, safely supports up to 450 kg with a high quality welding process, suitable for installation indoors and outdoors. We have pre-drilled two holes for screwing to wooden or concrete, can be installed in minutes. [360 rotatable design] Design with a strong heavy-duty hook, the hook can be rotated 360 and swiveled back and forth 180. Makes the hook more flexible, but less shaking. To safety, we have installed an O-ring made of metal to prevent the shaft from slipping out. The buckle of the hook is also strong enough to safety. [Pure relaxation] The hanging chair swing spring set allows you to swing, rock and turn gently and comfortably and see your suspension through the cushioning of bumps. With the steel spring, you can redesign your hanging chair and the most sophisticated seating option . [OPERATING-FRIENDLY]The ceiling hook hanging chair set with two pre-drilled holes for screwing to wooden , wood, rafters or concrete. Mark the mounting holes with a pen and then drill them with a drill. At you should tighten the expansion screw or the wood screw and hammer it in. [Versatile use] Professional ceiling mount and spring Perfect for hanging chair, hanging lamp, swing, love swing, hammock, punching bag, sling trainer, yoga towel, awning, sling trainer, hanging chair, hanging cave, hanging seat. colour: black Material: metal Package Contents: 4 x Ceiling hook 4 x Carabiner 8 x Expansion screw 8 x Screw Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.