Basic equipment: 5-arm polished aluminium base. Underpart-diam.: 560 mm Seat height adjustable by gas spring With around going hand ring release for height positioning under seat Seat base: Laminated wood. Seat: 350 mm diam. Seat upholstered, select between 41 colours for covering Movable swivel stools: Movable on 5 double castors, each 50 mm diam, with load dependent wheel brakes Castors usable for hard and soft floors High resistant castors, cover made of zinc-die-casting, cover chromed Castors with load dependent wheel brakes means: *Swivel stools burdened: Castors free movable *Swivel stools unburdened: Castors not movable Swivel stools not movable: Fixed standing on floor glides with high bearing face of 50 mm