chair mechanism 1,make to accept gas lift 2,seat height adjustable 3,any angle tilt lockable chair mechanism1,make to accept gas lift2,seat height adjustable3,any angle tilt lockableItem:HYT-Y19-71)Material: Steel2)Plate Thickness: 2.5mm3)Packaging: 10pcs/carton4)Carton size: 58x45x29cm5)N.W.: 2.25kg/pcs office chair mechanism