Ergonomic Laboratory Chair with Seat Tilt, Auto Back Rest and Black Aluminum 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" Foot Ring: 20" chrome twist lock Available Mechanism Adjustments: Seat height, seat swivel, seat depth, seat angle, back angle & back height COM Requirements 1 yd Weight Capacity 300 lbs 859CA Options 7" Stroke Cylinder: 19" - 26" (Order Ex. 859CA-7) T Style Arms (Order Ex. 859CA-T) Soft Wheel Casters or Glides (Please Specify)