supply of installtion high back ergonomic revolving executive chair with cushioned seat and backrest integrated head support and lumbar support durable pu leatherette upholstery padded armrests pneumatic seat height adjustment tilt mechanism with tension adjustment and upright locking 360 degree swivel heavy duty five star metal base with twin wheel castors minimum rated load capacity 120 kg bidder shall declare seat dimensions and seat height adjustment range supply fully assembled and ready fo