I have a Few Black Adjustable Office Swivel Desk Chairs £35 each. 
Most Have Adjustable. 2 Have fixed Arms 
Seat Width Between the arms is 47cms and seat depth to backrest is 42cms 
They are all Seat Heigt and Back Height Adjustsble and all have seat tilt 
Condition is fine. All functions work. Odd minor marl only 
I have a unit full of Office Chairs for viewing