The chair has a gas-lift height adjustment lever, and a back-tilt adjustment lever. An optional 3rd lever to tilt the seat can be added. The back height is adjustable as standard on these seats. The chair comes with no arms, with fixed loop arms, or with height-adjustable arms, and can be supplied with plastic glides instead of castors. Weight Tolerance 20 stone. Minimum Order Of 2 Chairs – for orders less than 2 chairs a surcharge applies – please contact the office for details.