1, Applicaton: For luxury manager chairs and executive chairs. 2, It is easy to lock and seat height adjustment 3, Function: It has brake control function The right handle controls the height of chair The handwheel enhances the strength synchronously The left handle extents and shrinks the brake Its biggest tilt angle is 20° , and the stillness angle is 3° Stock thickness: 3.0mm Installs Hole Position: 200*200mm Cartoon Zize: 52*43*25cm Qty/CTN: 5PCS N. W/CTN: 20.5kg G. W/CTN: 21.2kg.