1 Each. Workbench chair has an adjustable 18" footring and black microcellular, self-skinning polyurethane foam seat and back. Durable, steel 25" diameter base has black nylon shell coating and nylon glides. Functions include pneumatic seat-height control, 360-degree swivel, backrest height adjustment and seat-depth adjustment with ergo knobs. Seat adjusts from 22" to 32". Seat measures 18" wide x 16-1/2" deep. Back size is 17" wide x 12" high. Chair holds up to 250 lb. and weighs 30 lb. Workbench chair meets ANSI/BIFMA standards.