Black Frame - 25.8" x 25.8" x 40" Overall Dimension | Volt task chair offers comfort, function, and style and adapts to each user with simple comfort controls for added flexibility. Generous proportions and a contoured back deliver optimal comfort. Functions include pneumatic seat-height adjustment, 360-degree swivel, tilt, tilt tension and tilt lock. Design includes a fully padded back and seat and 2-1/2" hooded dual-wheel casters. Seat size is 18-1/2" wide x 18-3/4" deep. Usable seat depth is 18-3/4". Seat-to-floor height ranges from 18" to 22-1/4". Distinctive V-shaped back measures 17-1/4" wide x 18-3/4" high from the seat. Chair also features a plastic outer back and black frame. Chair meets or exceeds applicable ANSI/BIFMA and ISTA performance standards. Height-adjustable arms are sold separately.