A high back operator swivel desk chair with fixed arms and a curved back to provide maximum support Asynchro mechanism with three levers allows independent tilt adjustment of the backrest and the seat, whilst the third lever is for alteration of the seat height Height adjustable backrest enables the chair to be adapted to suit the user's body size 2 years guarantee: Conforms to BS 7176 Medium Hazard, making the chair suitable for use in the home as well as offices, government departments, schools and hospitals. Designed for 8 hour daily use and users up to 115 kg Product Dimensions (W x D x H): 60 x 60 x 91 cm: Seat height 46 to 59 cm, seat depth 43 cm, seat width 47 cm, back height 50 cm with back width 45 cm