Torso arm with locking ratchet-360°rotation 2. One Adjustable lever are easy to change seat height 3.Ultra stable base Description: 1. PU Leather Medical Doctor's Stool Adjustable Mobile Chair (2 Colors available, Blue, Black) 2. Handle for Lift, Pneumatic lift seat height adjustable 18"-24" 3. Adjustment Lever: A 360° "All-Around" pneumatic height adjustment lever that allows you to quickly adjust the pneumatic stool height from anywhere you reach under the seat. FDA Statement: The sale of this item may be subject to regulation by the U. Food and Drug Administration and state and local regulatry agencies. This item is in the category "Business & Industrial\Healthcare, Lab & Dental\Medical, Lab & Caregiving Furniture\Dental Examination Chairs". The seller is "dentistworks" and is located in this country: US. This item can be shipped to United States.