Commander II Series Options FABRIC ARMRESTS WHEELS Features Height Adjustable Headrest 2.5" Adjustable Standard Armrest Seat Back Angle Adjustment Tilt Rocker Adjustment Five-Star Base Steel Frame Seat Cushion Tilt Adjuster (7 Degrees - 3 Positions) Seat Cushion Length Adjuster (50 mm) Adjustable Mechanical Lumbar Gas Lift Height Adjustment Front Tilt Adjustment 2.5" Double Wheel Casters Replacement For KAB Office Chairs K1, K4 Premium, Associate, Iron Horse Office Chairs