Seville Classics UltraHD Cushioned Pneumatic Stool Overall dimensions with wheels: 18.25 x 18.25 x 24 to 28 in Height Overall dimensions without wheels: 18.25" x 18.25" x 21.5" to 25.75 in Height Zinc plated legs and footrest Seat swivels 360 Base of work stool: 18.25" diameter