Mesh Back Upholstered Task Chair With T-Arms. Upright Locking Position: Adjustable Tilt Tension Control. Pneumatic Gas Lift Provides Seat Height Adjustment. Overall Size: 25W x 26-1/2D x 40"H. Seat Height: 18" To 21-1/2"H - Black. Mfg #B6106 Boss Mesh Back Upholstered Task Chair With T-Arms , Black.