mechanism,swivel mechanism,pull back mechanism,armchair mechanism 1.Accept gas 2.Synchronized 3.3.5mmTHK mechanism,chair mechanism,pull back mechanism,swivel chair mechanism, ... chair parts Item.no.NBC003Material THK Steel plateThickness3.5mmweightN.W:16.4kg/ctnG.W:15.73kg/ctnUsageOffice swivel ... TPortShunde port Shenzhen port Neson NBC003 mechanism