A hanging chair must be hung so that it can rotate, so that the hanging chords do not wear thin, and so that one can swing in the desired direction. We have therefore created a ball-mounted ceiling hook with an extension chain for adjusting the height. Included are screws and specialized metal plugs. The provided screws are specifically intended for use with masonry. If you're attaching the Powerhook to wood, you should use your own suitable wood screws. To prevent rust and subsequent wood rot, it's advisable to use stainless steel screws. For optimal outcomes, select screws that are at least 6cm in length, with a thread barrel of 5mm and a head diameter of 9mm. Remember to use the provided masonry washers in conjunction with these screws.