ErgoMax ChairThe ErgoMax is a Super heavy duty weight chair with 3 lever mechansim with a height adjustable ratchet back. Comes standard with large moulded seat, extra heavy duty gas lift and hi Arch alloy 5 star base. Key Features: Heavy duty task chair chair weighted up 160kg Made in Australia with a 10 year warranty Delivered fully assembled 2 seat sizes available 3 lever mechanism with height adjustable ratchet back Back tilt, seat tilt and seat height