1.connected with the bottom of office chair 2.accept gas lift and spring lift 3.thickness 3.0mm,bearing more than 200kg Swivel ... customizedFunctionconnect with the bottom of office chair ,make to accept gas lift,for locking and tilting ,up and down your seat,make ... the oversea and the domestic market,including barstool swivel plates, lift up mechanism for coffee tables, all kinds of sofa parts ...