This ergonomic executive operator chair is specifically certified for 24 hour use and can take a maximum weight of 24 stone. It has an anti-shock function 5 position back and seat synchronisation. For extra comfort and support there is a lumbar adjustment on the backrest back height adjustment and headrest.. Certified 24 hour ergonomic executive operator (BS 5459-2: 2000). Rated to 24 stone . Stylish headrest for added comfort . Requires easy self assembly. Fully synchronised seat and back with tension control. Anti-shock function. 2:1 back and seat syncron (5 position). 4 position seat tilt and slide . Lumbar adjustment on backrest . Ratchet back height adjustment . Gas lift seat height adjustment . Seat height (mm) 520-620 . Seat height (mm) (front 510 - back 450 ) . Seat Width (mm) 480 . Back Height (mm) 510 (min 410 - max 450) . Weight 22.5kg *Self Assembly RequiredPlease note this product is delivered direct from our supplier and may take a little longer to arrive.