Torso arm with locking ratchet-360°rotation 2. One Adjustable lever are easy to change seat height 3.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". 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. The sale of this item may be subject to regulation by the U. Food and Drug Administration and state and local regulatory agencies. This item is in the category "Business & Industrial\Healthcare, Lab & Dental\Medical, Lab & Caregiving Furniture\Other Medical, Lab & Caregiving Furniture". The seller is "dentalbravo" and is located in this country: US. This item can be shipped to United States.