... 3.thickness 3.0mm,bearing more than 200kg Swivel Chair Mechanisms SeriesAbout model D13: Typeswivel chair mechanismPlace of OriginGuangdong, China ... of office chair ,make to accept gas lift,for locking and tilting ,up and down your seat,make your ... for functional sofa and sofa beds like headrest mechanisms,armrest mechanisms, transformable bed mechanisms, sofa legs and other sofa connecters. We ...