Ergonomic Laboratory Chair with Seat Tilt, Fixed Back Height and Black Composite Base Standard height adjustment: 23" to 33" Seat diameter: 20" W x 18 D Back Size 20 W x 18 H Base diameter: 24" Overall Height: 40.5" - 50.5" Comes with 20 chrome Foot Ring twist lock Available Mechanism Adjustments:Seat height, seat swivel, seat depth, fixed seat angle, fixed back angle & fixed back height COM Requirements 1 yd Weight Capacity 300 lbs 851CF Options 7" Stroke Cylinder: 19" - 26" (Order Ex. 851CF-7) T Style Arms (Order Ex. 851CF-T) Soft Wheel Casters or Glides (Please Specify)