Medium contoured shaped backrest with 3 dimensional curvature incorporating lumbar and spine support multi set mechanism for gas seat height backrest rake forward seat tilt and seat slide multi directional and height adjustable arms large black nylon base fitted with twin wheel hooded castors heavy duty gas lift 154 kilos 25 stone measurements seat width ndash 520mmseat depth ndash 490mmseat height ndash 440 540mmback width ndash 500mmback height ndash 530mm