Nautilus Designs Avon High Back 24 Hour Triple Lever Fabric Operator Office Chair With Height Adjustable Arms Black - BCF/R373/BK DDOur plush high back 24 hour operator chair with headrest is packed with features. Offering height adjustable arms, a height adjustable backrest its three lever mechanism provides a high level of adjustability via synchronous back and seat angle adjustment with seat height adjustment provided by a class 4 gaslift. Deep foam upholstered in durable fabric provides an extra level of comfort and a sturdy five star base offers solid dependability.